A.未完全下降至地面即可离开;-----
B.操作时禁止站在卷帘门下
C.任何人都可以随意操作卷帘门----
D.控制器能随意使用急停按钮
A.当电梯进入检修控制功能后,正常运行、紧急电动运行、对接操作运行都应失效;
B.电梯只能靠作业人员连续按压检修运行方向按钮慢速运行;
C.检修运行的速度不应大于1.0m/s;
D.可以设置轿顶、机房和轿内检修,但应有轿顶优先功能
A.断路器能通、断正常的负载电流,但不能分断短路故障电流
B.断路器实现了无熔丝保护,断路器有失压保护、欠压保护作用
C.电磁式断路器由电磁机构、脱扣机构、弹簧储能操作机构、栅片灭弧装置
D.断路器可用来分配电能,不频繁启动异步电动机,对电源线路及电动机实现保护
A.pull
B.pulled
C.pulling
D.questioning
Let's stop shouting at each other and talk about this like two__________ people.
A. sensitive
B. rational
C. exhausted
D. resourceful
A.polluting
B.filling
C.emitting
D.wasting
It's high time we______something to stop road accidents.
A.are doing
B.did
C.will do
D.do
A big dog ran in front of my mother's car and she ______ stop very quickly.
A.ought to
B.had better
C.must
D.had to
Man must stop _______ the earth’s atmosphere. A. filling B. wasting C. polluting D. blackening