问题
单项选择题
柴油机活塞、缸套及活塞环磨损时出现（）。
A.上排气
B.下排气
C.正常排气
D.上下排气
答案
参考答案：B
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柴油机活塞、缸套及活塞环磨损时出现（）。
A.上排气
B.下排气
C.正常排气
D.上下排气
参考答案：B
| 句型转换,把画线部分转换成同义或近义的词组。 |
| 1. The baskets were full of apples. The baskets______ ______ ______apples. 2. Because it rained, some students were late this morning. Some students were late this morning________ ________the rain. 3. Their parents went to New York by air. Their parents________ ________New York. 4. Don't talk about anything else. Let's get back to the main problem. Don't talk about anything else. Let's_________ ________ the main problem. 5. There are plenty of fun things to do. There are________ ________fun things to do |