制动器不能刹住重物的原因是什么？_爱下问搜题

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问题问答题简答题

制动器不能刹住重物的原因是什么？

答案

参考答案：

制动器杠杆系统中：有的活动铰链被卡住；制动轮工作表面有油污；制动带磨损，铆钉裸露；主弹簧张力调整不当或弹簧疲劳、制动力矩过小所致。

完形填空

The power of encouragement is great. You may draw some inspiration from the following story.
Dante Gabriel Rossetti, a famous 19th-century poet and artist, was once ______ by an elderly man. The old man had some sketches (素描) and drawings that he ______ Rossetti to look at and tell him if they were any good, or if they at least showed_____ talent.
Rossetti looked them____carefully. After the first few, he knew that they were worthless, showing not the least ____of artistic talent. But Rossetti was a_____ man, and he told the elderly man as gently as possible that the pictures were of little ______ and showed little talent. He was sorry, but he could not ____ to the man.
The visitor was ____, but seemed to expect Rossetti’s ____. He then apologized for ______ Rossetti’s time, but would he just ____a few more drawings—these done by a(n) ____ art student? Rossetti looked over the____ batch (一批) of sketches and immediately became enthusiastic over the talent they_____. “These,” he said, “oh, these are good. This young student has great talent. He should be given every____and encouragement in his career as an artist. He has a____future if he will work and stick to it.”
Rossetti could see that the old man was ______ moved. “Who is this fine young artist?” he asked. “Your son?” “No.” said the old man sadly. “It was I who painted the pictures 40 years ago. ____ I had heard your praise then! For you see, I got discouraged and___ drawing—too soon.”

A．disappointed

A．achievement

A．insisted on

多项选择题

牵拉肘的临床表现包括（）。

A.前臂被牵拉史

B.前臂不能上举及取物

C.桡骨头处压痛

D.肘关节半屈伸

E.X线检查异常