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【单选题】
单选题:4、汽车制动时,地面给车轮的制动力 F B 与车轮和地面之间的附着力 F A 的关系为( )。A.
F B ﹤ F A
B.
F B ﹥ F A
C.
F B ≤F A
D.
F B ≥F A
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皮皮学刷刷变学霸
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【多选题】在网络化的情况下，顾客概念及顾客行为发生了很大变化，下面四个属于消费变化的为：()
A.
顾客从大众中分离
B.
顾客直接参与生产和商业流通
C.
大范围地选择和理性的购买
D.
顾客追求价廉物美
E.
顾客追求时尚
【单选题】If drivers decide to make phone calls without considering the costs imposed on others, the:
A.
number of phone calls made while driving will be more than the socially optimal quantity.
B.
number of phone calls made while driving will be fewer than the socially optimal quantity.
C.
marginal social cost curve will lie below the marginal cost of production curve.
D.
marginal social benefit curve will lie below the marginal social cost curve.
【单选题】Two months later, some more money 14 (was sent /were sent) to Sam with another note:
A.
was sent
B.
were sent
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