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[单选题]
井口滑轮强制保养的内容为：拆开滑轮轴承、黄油嘴、承吊轴，清洗检查有无机械损伤，更换损坏部件，组装后必须（)。
A.刷防锈漆
B.刷油漆
C.给黄油嘴注入新黄油
D.给黄油嘴注入新机油
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.刷防锈漆
B.刷油漆
C.给黄油嘴注入新黄油
D.给黄油嘴注入新机油
如果结果不匹配，请 联系老师 获取答案
更多“ 井口滑轮强制保养的内容为：拆开滑轮轴承、黄油嘴、承吊轴，清…”相关的问题
起初松弛。当m自由下落一个距离h后绳子开始被拉紧。求绳子刚被拉紧时两物体的速度和此后M上升的最大高度H。
First he pulled the box up to the top of the building, and fastened the end of the rope so that the box could not come down. Then he climbed up the ladder and filled the box with bricks. Next he climbed down the ladder and untied the rope. Unfortunately the box of bricks was heavier than the man, and as a result he was pulled up by the: rope. Half-way up, the box of bricks hit him as it was coming down.
When he reached the top, his head hit the pulley. The box of bricks hit the ground and broke. As a result the bricks fell out. The box was then lighter than the man and consequently he began to come down and the box began to go up.
Half-way up, the box hit the man. The man still held on to the rope and the box therefore Continued to go up. The man then reached the ground. Then he let go the rope to rub his head. The box, of course, then fell down and hit the man on the head again. As a result, an ambulance came and took him to hospital
Why did the man fasten the end of the rope before he climbed up the ladder？
A．He was afraid that someone would steal his box.
B．Because he wanted to climb up along the rope.
C．He fastened the end of the rope in order to keep the box unmoved.
D．Because he wanted to prevent the box from coming down.
Passage Two
There was a big pile of bricks on the top of a tall building and a man
had to bring them down to the ground. He had a long rope which went over a pulley(滑轮) at the roof of the building. The other end was fastened to a big box.
First he pulled the box up to the top of the building, and fastened the end of the rope so that the
box could not come down. Then he climbed up the ladder and filled the box with bricks. Next
he climbed down the ladder and untied the rope. Unfortunately the box of bricks was heavier than
the man, and as a result he was pulled up by the: rope. Half-way up, the box of bricks hit him as it was coming down.
When he reached the top, his head hit the pulley. The box of bricks hit the ground and broke.
As a result the bricks fell out. The box was then lighter than the man and consequently he began
to come down and the box began to go up.
Half-way up, the box hit the man. The man still held on to the rope and the box therefore Continued to
go up. The man then reached the ground. Then he let go the rope to rub his head. The box, of
course, then fell down and hit the man on the head again. As a result, an ambulance came and took
him to hospital
40. Why did the man fasten the end of the rope before he climbed up the ladder？
A. He was afraid that someone would steal his box.
B. Because he wanted to climb up along the rope.
C. He fastened the end of the rope in order to keep the box unmoved.
D. Because he wanted to prevent the box from coming down.
