问题
单项选择题
活塞裙部的承磨环的主要作用是（）。
A．耐磨
B．支撑活塞
C．改善磨合
D．防震
答案
参考答案：C
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活塞裙部的承磨环的主要作用是（）。
A．耐磨
B．支撑活塞
C．改善磨合
D．防震
参考答案：C
| 用方框中所给单词的适当形式填空，使短文完整正确。（每个单词限用一次） | |
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| Robert found a job in a workplce after he finished middle school. His l was about twc. hundred kilometers away from the workplace, so he could't live at home from Monday to Friday. And he had not enough 2 . to live in the hotel, so the head of the workplace told him to live in the next room. At first be worked hard and 3 the workplace before his workmates came. And the head often praised him. Last winter the young man knew a girl at a party and soon they 4 friends. They 5 a lot of time at the cinemas, parks and shops. Robert went to bed very 6 and couldn't get up on time every moming. He was wamed for it, but he would not 7 . One morning Robert was late 8 . The head was angry with him and said, "All the 9 came here on time except you. And only you live 10 to the workplace!" "I'm sorry I can't agree with you, sir,"said Robert. "They all can find out the excuse on their way here if they get up late. But only I can't ! " |