题目内容

预防可燃和爆炸危险的一般措施包括？()①避免静电的产生而导致的火花放电;②杜绝外界点火源;③易燃易爆区域严格遵守放火安全标准;④易燃易爆舱室内阵低含氧量

A. ①②③④
B. ①②④
C. ①②③

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___________

A. hatch
B. character
C. match
D. switch

You _______ go now. It’s very late

A. had rather
B. prefer to
C. had better
D. would rather

下列说法是正确的()。

A. 分散化投资使系统风险减少
B. 分散化投资使因素风险减少
C. 分散化投资使非系统风险减少
D. 分散化投资既降低风险又提高收益

It was in 1930 _______ he became a university student.

A. when
B. tha
C. which
D. and