每天施工前班组长必须提前对班组成员做班前交底,交底内容包括()。
A.操作流程
B.成品保护
C.安全文明施工
D.作业条件及其要求
参考答案:A, B, C, D
下列四组物质中,前者属单质,后者属化合物的是( )
A.氧气、空气
B.液氧、石灰水
C.水、高锰酸钾
D.液氮、冰水混合物
This dress is prettier, but it costs ______ that one.
A.twice more than
B.twice as much as
C.as much twice as
D.twice so much as