施工单位对电梯井门应按定型化、工具化的要求设计制作,其高度应在()范围内。
A. 10至18m
B. 10至15m
C. 15至18m
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某霓虹灯厂在一饭店门头上方安装霓虹灯,在焊接作业时未设置接火装置。导致焊渣落至门厅的地毯上,无人发现,引起火灾。等工人午饭后回到现场,门厅已烧毁,造成经济损失40多万元。造成事故的直接原因是()。
A. 事故现场无人看守
B. 收工前未巡视现场
C. 焊接作业时未设置接火装置
挂梯移动时高出作业人员应该()挂梯。
A. 扶住
B. 离开
C. 拽动
The statement "trading analogue dollars for digital pennies "(Para. 2)implies .
A. the lamentation of disruption of fortune caused by Internet
B. NBC Universal has changed its tune of digital pennies
C. digital media cannot rival with the old one
D. digital section of media contributes more to Jeff Zucker"s industry
Jeff Zucker believed that digital media is gaining its importance most probably because______.
A. the emergence of "all-access" services
B. the easy availability of the media content
C. the profitability brought by cyber technology
D. the low price of the monthly fee
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