造成变速箱齿轮齿和异响的原因很多，根据异响特征分析诊断故障原因，若响声均匀则为（）所致。
参考答案：齿面磨损
可与硫酸苯肼羰基试剂反应而不变色的药物有（）。
A.醋酸可的松
B.氢化可的松
C.黄体酮
D.泼尼松
E.阿托品
将下列各句变为反意疑问句。
1. There is going to be a meeting, ?
2. Jenny has few good friends in her class , ?
3. Let's go, _____?
4. Let us go, ?
5. Don't play with water, ?
6. He looks unhappy, ?
7. The old man hardly sees nothing, ?
8. There is nothing in the box, ?
9. Everything goes well, ?
10. Everyone is here , ?
11. He has never been there, ?
12. I think he will come , ____?
