The Consol navigation system，used in Russian and Northern European waters，can be used（）.
A body can only be observed at lower transit when（）.
Sufficient cargo tanks shall be（）prior to each ballast voyage in order that，taking into account the tanker’s trading pattern and expected weather conditions，ballast water is put only into cargo tanks which have been crude oil washed.
When（）clean ballast water from any vessel，an application shall be made to Harbor Authorities for approval.
We had to learn chemical（）at school but I can only remember H2O for water.
In the case of new crude oil tankers，the additional ballast permitted shall be carried in cargo tanks only if such tanks have been（）before departure from an oil unloading port or terminal.
The reciprocating pump can’t draw water from a tank may be caused by （）.
Small oil spills on deck can be prevented from contaminating any waters by （）.
Impurities from the boiler water surface can be removed through the （）.
Permission is kindly requested（）the ballast water.
High diesel engine cooling water temperatures can be caused by （）.
Authentic materials can only be used in the classroom for beginners.（）
Which of the following liquids can ordinarily be discharged overboard without being processed through an oily water separator?（）
A water pump can not supply water after startingIt may be caused by （）.
Ways to reduce energy and water consumption can be understood as an informational process.
Stereotype can only be individual.
Water can be seen as a symbol of rejuvenation and purification.
Rail transport can only be arranged within one country.
OTC drugs can only be sold at a pharmacy.
Only gifted people can be brilliant at everything.
A trade fair can only be attended by company representatives and members of the press only.
A fire in a ballast pumproom can be brought under control with minimal impact on stabilityby ___________.
The virus can only be transmitted through （) contact.
