if(buttonStateA==HIGH && brightness!=255) 语句表示（）

A . corrosive deterioration of a bearing B . inadequate air filtration C . excessive ring and liner wear D . excessive cooling of lubricating oil

A . be interrupted B . move downwards C . move outwards D . retain original positio

A . a dirty lube oil strainer B . internal water leaks C . an oil suction line restriction D . excessive wears of the cooling water pum

A . too light of a load B . injection timing is too early C . overloading of the engine D . too low of a compression ratio

A . purge the condenser if the waterside is dirty B . check for proper water flow through the condenser C . increase the high pressure cutout setting D . reduce the cooling water flow

A . close the static leg filling valve B . close the overflow tank falling valve C . reduce the fuel oil pumping rate D . stop the fuel oil pumping operatio

A . pressure B . temperature C . viscosity D . density

A . notify the duty officer, reduce the engine speed, take some measures to remove failures B . notify the duty officer and stop the engine immediately, find the cause and remove failures C . notify the C/E D . notify the captai

A . a clogged scale trap B . air in the system C . automatic controls not functioning properly D . insufficient cooling water to the condenser

A . sensor failure B . failed alarm C . low level D . extremely high level

A．Right B．Wrong C．Not mentioned

A．B的值为2.0。 B．B的值为1.0。 C．B的值为3.0。 D．B的值为2.0。

A.be interrupted B.move downwards C.move outwards D.retain original position

Question 1 to 5 are based on the following passage. If you think a high-factor sunscreen(防晒霜)keeps you safe from harmful rays, you may be wrong. Research in this week&39;s Nature shows that while factor 50 reduces the number of melanomas(黑瘤)and delays their occurrence, it can&39;t prevent them. Melanomas are the most aggressive skin cancers. You have a higher risk if you have red or blond hair, fair skin, blue or green eyes, or sunburn easily, or if a close relative has had one. Melanomas are more common if you have periodic intense exposure to the sun. Other skin cancers are increasingly likely with long-term exposure. There is continuing debate as to how effective sunscreen is in reducing melanomas—the evidence is weaker than it is for preventing other types of skin cancer. A 2011 Australian study of 1,621 people found that people randomly selected to apply sunscreen daily had half the rate of melanomas of people who used cream as needed. A second study, comparing 1,167 people with melanomas to 1,101 who didn&39;t have the cancer, found that using sunscreen routinely, alongside other protection such as hats, long sleeves or staying in the shade, did give some protection. This study said other forms of sun protection—not sunscreen—seemed most beneficial. The study relied on people remembering what they had done over each decade of their lives, so it&39;s not entirely reliable. But it seems reasonable to think sunscreen gives people a false sense of security in the sun. Many people also don&39;t use sunscreen properly-applying insufficient amounts, failing to reapply after a couple of hours and staying in the sun too long. It is sunburn that is most worrying-recent shows five episodes of sunburn in the teenage years increases the risk of all skin cancers. The good news is that a combination of sunscreen and covering up can reduce melanoma rates, as shown by Australian figures from their slip-slop-slap campaign. So if there is a heat wave this summer, it would be best for us, too, to slip on a shirt, slop on(抹上)sunscreen and slap on a hat. 1.What is people&39;s common expectation of a high-factor sunscreen？ A.It will delay the occurrence of skin cancer. B.It will protect them from sunburn. C.It will keep their skin smooth and fair. D.It will work for people of any skin color. 2.What does the research in Nature say about a high-factor sunscreen？ A.It is ineffective in preventing melanomas. B.It is ineffective in case of intense sunlight. C.It is ineffective with long-term exposure. D.It is ineffective for people with fair skin. 3.What do we learn from the 2011Australian study of 1,621 people？ A.Sunscreen should be applied alongside other protection measures. B.High-risk people benefit the most from the application of sunscreen. C.Irregular application of sunscreen does women more harm than good. D.Daily application of sunscreen helps reduce the incidence of melanomas. 4.What does the author say about the second Australian study？ A.It misleads people to rely on sunscreen for protection. B.It helps people to select the most effective sunscreen. C.It is not based on direct observation of the subjects. D.It confirms the results of the first Australian study. 5.What does the author suggest to reduce melanoma rates？ A.Using both covering up and sunscreen. B.Staying in the shade whenever possible. C.Using covering up instead of sunscreen. D.Applying the right amount of sunscreen.

A.do nothing with your health B.decline in your system C.lead to toxicity D.cure you quickly

A．They can adjust the handles. B．They need to talk to their personal trainers. C．They need to change the machines. D．They can move the seat up.

A、Senior debt. B、short-term debt. C、Secured bank debt.

— The scrf is nice, but the price is little bit high. — _______, but if you wnt good qulity, you hve A．No wonder B．No doubt C．No offence D．No problem

I think if is high time we ______ the fct tht environmentl pollution in thisre is getting more serious thn befor A．woke up to B．must wake up to C．wake up to D．are waking up to