问题
多项选择题
振动桩锤的保养与维护时应（）
A.注意检查电动机的温升，一般情况下一次振动时间不应超过15min
B.注意液压缸是否漏油，若漏油严重可能会使夹持器与桩分离
C.经常检查齿轮箱中的润滑油面，注意经常补充齿轮油
D.检查液压油管是否有磨损，接头是否松动、漏油
E.注意检查液压泵的工作压力
答案
参考答案：B, C, D, E
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振动桩锤的保养与维护时应（）
A.注意检查电动机的温升，一般情况下一次振动时间不应超过15min
B.注意液压缸是否漏油，若漏油严重可能会使夹持器与桩分离
C.经常检查齿轮箱中的润滑油面，注意经常补充齿轮油
D.检查液压油管是否有磨损，接头是否松动、漏油
E.注意检查液压泵的工作压力
参考答案：B, C, D, E
A boy was walking home from school when he saw a large, tempting(诱人的) apple on one of the branches of an apple tree hanging out over a tall fence. The boy wasn’t much of a fruit-eater, 26 a bar of chocolate if given the choice, 27 , as they say, the forbidden fruit can be tempting. Seeing the apple, the boy wanted it. The more he looked at it, the 28 he felt and the more he wanted that apple. He stood on tiptoe(脚尖), ___29 as high as he could , but even at his tallest 30___ he was unable to touch it. He began to 31 up and down, as high as he could, at the 32 of each jump stretching his arms to get the apple. Still it remained out of 33 . Not giving up, he thought, if only he had something to 34 on. His school bag wouldn’t give enough height and he didn’t want to 35 the things inside, like his lunch box, pencil case, and Gameboy. Looking 36 , he hoped he might find an old box, a rock, or, 37 luck, even a ladder, but it was a tidy neighborhood and there was nothing he could use. He had tried everything he could think to do. 38 seeing any other choices, he gave up and started to walk 39 . At first he felt angry and disappointed thinking about how hungry he had become from his 40 , and how he really wanted that apple. The more he 41 like this, the more unhappy he became. 42 , the boy of our story was a pretty smart guy, even if he couldn’t always get what he wanted. He started to say to himself, “This isn’t 43 . I don’t have the apple and I’m feeling miserable as well. There’s 44 more I can do to get the apple—that is unchangeable—but we are supposed to be able to 45 our feelings. If that’s the case, what can I do to feel better?
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