功角暂态稳定的判据是，电网遭受到一次大扰动后，引起电力系统各_爱下问搜题

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问题单项选择题

功角暂态稳定的判据是，电网遭受到一次大扰动后，引起电力系统各机组间的功角相对增大，在（）不失步。

A.第一、第二摆

B.第三、第四摆

C.5摆以外

D.以上都不是

答案

参考答案：A

补全对话，情景问答

从方框中所给的选项中选择正确的选项补全对话。

A. What does he do?
B. Do you come from the U.S.A?
C. Where does he live now?
D. What does he say in the letter?
E. Could you tell me your name?

A: Excuse me, (1)_______
B: Sure. My name is John.
A: (2)_______
B: Yes, I do. Look, this is a letter from my pen pal.
A: (3)_______
B: He is a cook.
A: (4)_______
B: He lives in Canada.
A: (5)_______
B: In the letter, he says he wants to visit me next month.
1._______ 2._______ 3._______ 4._______ 5._______

填空题

常见的营养教育方式有______、______、______。