问题
多项选择题
由于操作不当，造成轴瓦烧坏的原因有（）。
A.润滑油不干净
B.排气温度过高
C.制冷剂流量太小
D.活塞走偏
答案
参考答案：A, B, D
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由于操作不当，造成轴瓦烧坏的原因有（）。
A.润滑油不干净
B.排气温度过高
C.制冷剂流量太小
D.活塞走偏
参考答案：A, B, D
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| We are middle school 1____________. We are 2____________ Grade 7. Kate, Mike, Lucy 3____________ I are in Class One. Kate 4____________ eleven. Mike and Lucy are twelve. I am thirteen. We have a new 5____________. In it you can 6____________ 40 desks and chairs. A blackboard, a clock and a map are on the wall. The map is a 7____________ China. 8____________ brooms are behind the door. On a desk you can see some pens. The red 9____________ is Kate's. Look at the clock. It's four o'clock. It's time 10____________ play games.
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