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【单选题】
某汽车空调压缩机常因缺油而损坏，但检修时发现冷凝器和蒸发器均有润滑油，造成此故障的原因是（）。A.
压缩机的功率过小
B.
压缩机的材质不耐用
C.
压缩机的阀片强度不够
D.
用错了润滑油
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【简答题】A．8×10 9 /L B．9×10 9 /L C．10×10 9 /L D．12×10 9 /L E．接近成人水平
【单选题】(9-12 from P.105-109)Why was the process of taming almost always involved with the castration of male animals?
A.
Because it restrains male aggression and enables humans selectively to control the herd’s procreation.
B.
Because castrated(阉割的)livestock gain weight quicker than livestock that have not been castrated.
C.
Because animals that have not been castrated produce a tougher carcass and the flavor of the meat is strong.