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问题 单项选择题 B型题

超声心动图能测出心包积液，估计其液体量至少已达（）。

A.＜30ml

B.50ml

C.150ml

D.500ml

E.250ml

答案

参考答案：B

解析：3.心包积液超过300ml时X线心影扩大。

单项选择题

新建建筑物基础和原有相邻建筑物基础间的净距L与两基底标高差△H的关系是( )。

A．1=(0.5-1)△H
B．1=(1-2)△H
C．L≥(1-2)△H
D．L≥2△H
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单项选择题

New disposal fees for toxic chemicals used in producing plastic house plants have increased production costs by $ 0.28 per plant for all manufacturers in the industry. The most likely effects on the industry supply curve and total producers’ surplus in the market for plastic house plants are: Industry supply Producers’ surplus（） ①A. shifts left increases ②B. shifts left decreases ③C. shifts right decreases

A. ①

B. ②

C. ③
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