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【多选题】
有关流体静力学方程的描述,正确的是A.
描述静止流体内部的压力与所处位置之间的关系
B.
研究流体在重力场中处于静止状态时的平衡规律
C.
同一静止流体中，处于不同位置流体的位能和静压能各不相同，但两者之和保持不变
D.
静力学方程可用压力形式表示，也可用能量形式表示
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【单选题】The cost is too big for playing basketball: a pair of shoes can't be weared, and a pair of trousers______broken.
A.
have
B.
have been
C.
has
D.
has been
【单选题】If the price of a dress is three times the price of a pair of shoes, then a pair of shoes contributes
A.
a. exactly one-third as much to GDP as does a dress.
B.
b. more than one-third as much to GDP as does a dress.
C.
c. less than one-third as much to GDP as does a dress.
D.
d. exactly one-fourth as much to GDP as does a dress.
【单选题】某商品流通企业经销某种商品的变动费率为0.7，固定成本分摊为l6.2万元，该种商品的销售单价为2700元／台。该种商品的保本销售量是（ ）台
A.
190
B.
200
C.
210
D.
220
【单选题】某商品流通企业经销某种商品的变动费率为0．9，固定成本分摊为9万元，该种商品的销售单价为1200元/台。计划期的目标盈利额为3万元，预计在计划期销售（ ）台才能完成目标盈利额。
A.
1200
B.
900
C.
1000
D.
1500
【单选题】某商品流通企业经销某种商品的变动费率为0.7，固定成本分摊为16.2万元，该种商品的销售单价为2700元/台。该种商品的保本销售量是( )台。
A.
190
B.
200
C.
210
D.
220
【单选题】某商品流通企业经销某种商品的变动费率为0．8，固定成本分摊为7万元，该种商品的销售单价为1400元/台。该种商品的保本销售量为（ ）台。
A.
220
B.
230
C.
240
D.
250
【单选题】Which of the following is intended to be a pair of contrast in the passage?
A.
Huge crowds and lonely individuals.
B.
Weather conditions and street lamps.
C.
Clattering trains and peddlers' yells.
D.
Moving crowds and street traffic.
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