问题
单项选择题
旋翼锥度角主要和旋翼的（）有关。
A、所受离心力
B、转速
C、所受离心力和转速
D、都没关系
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
旋翼锥度角主要和旋翼的（）有关。
A、所受离心力
B、转速
C、所受离心力和转速
D、都没关系
参考答案：C
| 补全对话。 | |
| A: Hello, Tony! Nice to meet you! B: Hi, Bob! Nice to meet you, too! A: You look terrible.1_____________ B: Oh,I am always tired these days. A:2________________________________________________ B:I think so. When I am in Grade Three, everything is different. A: Really? B: Yes, we used to have music classes and we could listen to more songs to relax, but now we don't have music classes and we have to have tests every day. A: Don't worry, Tony.3____________________________________ B：4____________________________________ A: Just so-so.I am going to have an English exam. I have to study for this test. B：5________________________ A:I study by doing more exercises. B：Good luck! A: Thank you! Then see you later.
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