After a fire has been extinguished in a closed space, personnel may safely enter the space when
A.smoke density has been decreased sufficiently to see the bulkhead opposite the compartment's entrance
B.a lifeline and explosion proof flash light are used
C.all smoke and toxic fumes are removed and an adequate oxygen supply is present
D.overhaul has been completed to remove any possible source of re-ignition
第1题:
表达式LEN(SPACE(3) ----SPACE(2》的结果为【 7 】。
第2题:
设A="abcd"+space(5),B="efgh",则A-B的结果与下列______。选项的结果相同。
A.abed+space(5)+"efgh"
B.abed+"efgh"
C.abcd+"efgh"+space(5)
D.abcd+efgh"+space(1)
第3题:
Word 进行强制分页的方法是按()组合键。
A.“Ctrl+Shift”
B.“Ctrl+Enter”
C.“Ctrl+Space”
D.“Ctrl+Alt”
第4题:
表达式LEN(SPACE(5)-SPACE(10))的结果为【 】。
第5题:
在Vegas pro 11.0中对视频文件进行预览时,快捷控制键Space与Enter的效果是相同的。
第6题:
在Word 2010中插入人工分页符的快捷键是________
A.【Ctrl】+【Enter】
B.【Ctrl】+【Space】
C.【Alt】+【Enter】
D.【Shift】+【Enter】