问题
单项选择题
本次大赛使用的螺纹润滑剂又称（）。
A.二硫化钼
B.凡士林
C.石墨
D.二硫化硅
答案
参考答案：A
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本次大赛使用的螺纹润滑剂又称（）。
A.二硫化钼
B.凡士林
C.石墨
D.二硫化硅
参考答案：A
| 完形填空。 | |||
| Jane and John 1 sister and brother. They like music. Jane can play the piano. But she 2 play the violin. John can't play the piano. But he 3 play the violin. Today they 4 to carry a piano to 5 bedroom. 6 piano is heavy (沉). They can't 7 it. 8 parents aren't at home. But they 9 a cousin brother Mike. He is here today. They ask Mike to 10 them. | |||
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