环境质量评价类型可以按评价时间分为回顾性评价、环境质量现状评价和下列的哪一项（）
A. 大气质量评价
B. 环境影响评价
C. 水质评价
D. 土壤质量评价
E. 总环境质量评价
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鸣笛转换器触点开关为常闭，动作压力为200kPa。
A. 正确
B. 错误
无线电话不保密，有线电话是保密的，可以通过普通电话交谈涉密事项。
A. 正确
B. 错误
If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）
A. inspection covers should not be opened until the engine has cooled
B. ventilation system should be continued in operation for one hour for cooling
C. scavenge pump should be immediately secured to prevent loss of lube oil
D. explosion covers should be opened slightly to provide extra ventilatio
增温增湿滚筒的机架上装有四个托轮，四个托轮托住滚筒，并使其能处于正确的运行位置。
A. 正确
B. 错误
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