Myfrienddoesonethingonedayandjustthe______thenext.Hisbehaviorisinconsistent.
A. other
B. alternative
C. negative
D. opposite
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Theydidconsiderableworkto______themassesoftheUnitedStateswiththeelementaryproblemofLatinAmerica.
A. instruct
B. acquaint
C. devote
D. impart
Ifelttiredoftheperformanceandwasabouttoleave,______somethingoccurredwhichattractedmyattention.
A. unless
B. while
C. when
D. until
干式卧式壳管式蒸发器制冷剂在管内流动,而载冷剂在管外(壳体内) 流动。
A. 对
B. 错
满液式卧式壳管式蒸发器载冷剂下进上出,走管程。
A. 对
B. 错