起重机械和起重作业中广泛采用()钢丝绳。
A.混合绕
B.顺绕
C.交绕
参考答案:C
.—English has a large vocabulary, hasn’t it?
--Yes._____ more words and expressions and you will find it easier to read and communicate.
A.Knowing
B.Know
C.To know
D.Knew
食管疾病可能引起的症状有()
A.吞咽阻挡感
B.吞咽疼痛
C.呼吸困难
D.吞咽困难
E.呕血