为了防止石棉橡胶垫片粘着在法兰密封面上和便于拆卸,应在垫片表面均匀地涂上()。
A、石墨粉
B、润滑脂
C、机油
参考答案:A
Mary didn’t want of the two kinds and asked the shop assistant to show her .
A.both; the other
B.all; the others
C.either; another
D.neither; another
买入并持有策略图为()。