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【单选题】
平面力和力偶的关系是:A.
力 偶 可用一个平衡；
B.
力偶可以用一个代替；
C.
力偶可以合成为一个力偶；
D.
力偶对刚体的作用效应是相同的。
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【单选题】Under conditions of decreasingcost:
A.
Under conditions of decreasingcost: externalities are irrelevant andinapplicable.
B.
afew large ellers may come todominate the industry.
C.
astrong case can be made forsupplanting complete individualismby some kind of group action.
D.
each of firms in the industry will continue to produce more outputat falling costs per unit.
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【简答题】Laws concerning discrimination and the conditions under which individuals may be ____________(依法为……负责)their actions are influenced by the research.
【简答题】The insurance under the PICC Ocean Marine Cargo Clauses is classified into three conditions: ______, ______ and ______.
【简答题】Their parent once lived under very severe conditions.
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