单项选择题
My parents used ________they had to get a new car for my brother.A. which B. allwhat C. what D. 不填
单项选择题 某流体在稳流装置内经历一个不可逆过程，加给装置的功为25kJ，从此装置带走的热量（即流体吸热）为10kJ。试问流体的熵变为（）。
单项选择题 “他是旧时代的最后一位诗人，同时又是新时代最初一位诗人”，这位诗人的代表作是（）
单项选择题 The two ladies are ________ the same age, but there seems to be ten years ________them.A. at, between B. about, among C. as,among D. of, between
