问题
单项选择题
起落架不能完全收起的一个可能原因是：（）.
A.储压器充气压力不足或充气活门渗漏。
B.系统回油管路渗漏。
C.系统油液不够。
D.液压油牌号不对。
答案
参考答案：B
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起落架不能完全收起的一个可能原因是：（）.
A.储压器充气压力不足或充气活门渗漏。
B.系统回油管路渗漏。
C.系统油液不够。
D.液压油牌号不对。
参考答案：B
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2 work to do. We can't 3 our work in the daytime and we must do it at 4 . We go to bed very 5 and get up very 6 . So we can't get enough sleep. Most people need at least eight hours of sleep. If we 7 for only five or six hours a night, we will be tired. Secondly, when we are ill, we will be tired. But we don't know we are ill. So if you are always tired, perhaps you are not so healthy. You'd better go to see a 8 . Thirdly, perhaps you shouldn't eat some kinds of food like eggs, nuts, meat or chocolate. If you are 9 and tired after eating some food, please don't eat again. At last, if the air around you isn't clean, you will feel tired. So please open your 10 often or go out for a walk and you will feel better. |