The boom of American agriculture is mainly due to the generosity of nature.

A . Cranes are able to pick up and drop loads over a greater spotting area B . Increased safety because the deck is clear of running and standing rigging C . Simplicity of operation of the crane by its operator D . All of the above

A . winch speed B . boom strength C . load radius D . cable strength

A . Shrouds B . King posts C . Stays D . Turnbuckle

A . breaking a cargo runner B . parting guys topping lifts C . carrying away a block D . overheating the resistors and eventually burning out

A . operated by one winchman B . cradled on deck C . swung from one hatch to the adjacent hatch D . collared to the mast

A . boom B . lift C . raise D . tackle

A . the reappearance of the"powwow" B . the legal steps they are taking to recover land and resources that have been grabbed form them illegally C . their refusal to live on reservations D . None of the above

A . rigging a back stay B . raising the boom C . increasing the mechanical advantage of the cargo purchase D . taking all slack out of the preventer

A . increases as the cargo closes the head while hoisting B . increases if the cargo runner is doubled up C . decreases as the boom is topped to a greater angle D . is determined by the thrust stresses on the boom

A . maximum counter weight required B . minimum horsepower required C . hoist rope strength D . allowable load

A . inserted each time before the booms are cranked out B . periodically removed for inspection and lubricated C . replaced at each inspection for certification D . in the locked position after the boat is cradled and griped dow

A . Stopping the boom B . Topping or lowering the boom C . Moving the boom left or right D . All of the above

A . but there is no provision in the Constitution for political parties B . and the Constitution has clear provision C . but the founding fathers had strong apprehension of political parties D . Both A and C

A . boom angle B . boom strength C . load radius D . cable strength

American has always been a land of beginnings. After Europeans 'discovered' America in the fifteenth century, the mysterious New World became for many people a genuine hope of a new life, an escape from poverty and persecution, a chance to start again. We can say that, as nation, America begins with that hope. When, however, does American literature begin？ American literature begins with American experiences. Long before the first colonists arrived, before Christopher Columbus, before the Northmen who 'found' America about the year 1,000, Native Americans lived here. Each tribe's literature was tightly woven into the fabric of daily life and reflected the unmistakably American experience of lining with the land. Another kind of experience, one filled with fear and excitement, found its expression in the reports that Columbus and other explorers sent home in Spain, France and England. In addition, the journals of the people who lived and died in the New England wilderness tell unforgettable tales of hard and sometimes heartbreaking experiences of those early years. Experience, then, is the key to early American literature. The New World provided a great variety of experiences, and these experiences demanded a wide variety of expressions by an even wider variety of early American writers. These writers included John Smith, who spent only two-and-a-half years on the American continent. They included Jonathan Edwards and William Byrd, who thought of themselves as British subjects, never suspecting a revolution that would create a United States of America with a literature of its own. American Indians, explorers, Puritan ministers, frontier wives, plantation owner -- they are all the creators of the first American literature. What does 'that hope' in the first paragraph refer to？ A．The hope that America would be discovered. B．The hope to start a new life. C．The hope to see the mysteries of the New World. D．The hope to find poverty here.

A．the eagerness of Americans for a stronger economy B．the fear that child labor is involved in imported goods C．some serious disasters that struck factories overseas D．Walmart"s efforts to transport American-made goods