A.反应必须无水,最好不断除水。
B.催化剂可用对甲苯磺酸。
C.催化剂可用氢氧化钠。
D.催化剂可用氯化氢。
第3题
A、TV, movies, and the Internet will become dominant fixtures in their lives.
B、They may suffer from depression, anxiety or a decrease in self-esteem.
C、Their lives will be improved by such a pleasant diversion.
D、They will no longer live their lives in a fantasy world.
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