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问题 单项选择题

关于稳定自转下滑正确说法是（）.

A.旋翼不产生拉力

B.不产生俯仰力矩

C.尾桨产生拉力

答案

参考答案：C

填空题

写出两个无理数，使这两个无理数的积为有理数，那么这两个无理数可以是______和______．
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补全对话，情景问答
补全对话，从方框里选择恰当句子。
a. What do you have for lunch
b. I'm hungry
c. What would you like for lunch
d. Good afternoon
e. What about you
A: Good afternoon! Amy.
B: 1____________! Mike.
A: It's time for lunch. 2____________?
B: I have some beef. 3____________?
A: I don't have lunch. 4____________.
B: 5____________?
A: I'd like some cakes and milk.
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