桥式起重机分为手动梁式起重机(组代号为L),电动梁式起重机(组代号为L)和电动桥式起重机(组代号为())三大组。
A.Q
B.L
参考答案:A
—Mike, you don't seem to be quite today.
—Well, I hardly slept last night. I was preparing for a report.
A.itself
B.ourselves
C.you
D.yourself
疏排题是图书中章节标题常采用的标题形式,一般而言()
A.如果标题是两字,字之间空两字
B.如果标题是四字,字之间空两字
C.如果标题是五字,字之间空一字
D.如果标题是五字以上,字之间须空半字以上