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【单选题】
卵巢的结构中具有排卵窝的动物为A.
马
B.
牛
C.
猪
D.
犬
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反馈参考答案：
举一反三
【单选题】液压电梯因停电或故障把乘客困在井道中的救援方法是：用泵站面上的紧急救援用手动泵和手动（）把轿厢上升或下降至靠近层站（门区范围）打开层、轿门让乘客离开。
A.
盘车装置
B.
放油阀
C.
按钮
D.
检修开关
【单选题】Don't run in the hallways, or you may _____ somebody. [ ]
A.
knock into
B.
knock at
C.
fall into
D.
fall down
【单选题】Beginning from a long run equilibrium in an increasing cost industry, if there is a substantial, permanent fall in demand for industry output:
A.
firms will leave the industry, the quantity produced will fall, and prices will end up lower than their initial long run equilibrium level.
B.
firms will leave the industry, the quantity produced will fall, and prices will end up higher than their initial long run equilibrium level.
C.
firms will leave the industry, the quantity produced will fall, and prices will end up at the same level as their initial long run equilibrium level.
D.
firms will enter the industry, the quantity produced will rise, and prices will end up lower than their initial long run equilibrium level.
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