刮板输送机发生刮板链在底槽出槽故障的原因可能是()。
参考答案:输送机本身不平直
.
Joe’s_______ in the get-together surely brought us a lot of pleasure as he is a man with a
strong sense of humour.
A.joining
B.having been joined
C.joined
D.had joined
「手紙」的意思是()。
A、手纸
B、邮件
C、短信
D、信件