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【单选题】
某广告企业在广告施工中使用脚手架作业,一工人走在脚手板上突然脚手板一头翘起,失足掉下。幸好高度不高,只是扭伤了脚,事故的直接原因是( )。A.
工人没有注意探头板
B.
脚手板未按规范用铅丝固定
C.
脚手板不应有探头板
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
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【多选题】某纺织厂车间一客货两用电梯发生故障，停在车间2～3楼之间，轿厢力堆放着生产急需的棉纱，为不影响车间产生，车间主任便叫来电工小张和钳工小戴，要他们两人配合把轿厢移到3楼，由于小张和小戴不是电梯维修工，不懂得怎样移动轿厢，便动手拆下制动器的制动弹簧，导致电梯向上溜车冲顶，冲顶时轿厢内装运棉纱的推出把搬运工挤伤骨折.（ ）
A.
小张和小戴没有电梯维修资格证，不能上岗
B.
拆下制动弹簧时，应扶住盘车手轮
C.
应该打急修电话，派有经验的电工前来修理
D.
移动轿厢时，应用手动松闸装置松闸.
【简答题】什么叫人为故障?
【简答题】以太网的数据帧封装中，包含在TCP段中的数据部分最长应该是（ ）字节。（注：本题中IP和TCP都只有首部固定长度，且以太网的MTU=1500字节）
【单选题】There was a terrible noise ________ the sudden burst of ligh
A.
followed
B.
following
C.
to be followed
D.
being followed
【单选题】以太网的数据帧封装中,包含在TCP段中的数据部分最长应该是 字节。(注:本题中IP和TCP都只有首部固定长度,且以太网的MTU=1500字节)
A.
1480
B.
1460
C.
1450
D.
1500
【简答题】The candle cast a flickering light on the wall是
【单选题】Agitated Sunspot Cause Trouble If the lights in your house keen flickering, blame frequent sunspots. A sunspot is actually charged particles flying at the speed 6f 3 million kilometers an hour out of ...
A.
Ionosphere is high above the earth.
B.
One is that the magnetic filed of the earth is much disturbed because of the sun's interference in the ionosphere which is 80 to 500 kilometers above the earth.
C.
Scientists also say that the active movement of the charged sun storm also has effects on earthquakes.
D.
Every 11 years, the sun, as its energy accumulate inside up to a certain point, will send out streams of charged particles, which affect the earth in different ways.
E.
But the communication situation in each case returned to normal in about 24 hours.
F.
So, scientists warn that people going outdoors should be careful to protect their exposed skin and eyes with clothes, umbrellas and sunglasses from the strong sunlight rich.in ultraviolet rays.
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