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【简答题】
在电压型逆变电路PWM控制中,同一相的上下两个臂的驱动都是__________,但实际上为了防止上下两臂短路,在上下两臂通断切换时要留一小段上下臂都施加关断信号的死区时间,其长短是由__________________决定的。
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【简答题】仔细阅读，补全对话。 A. cards B. checkers C. badminton D. do A: I want to play 1____________. What do you want to 2____________? B: I don't want to play badminton now. Let's play 3____________ or 4____...
【单选题】仔细阅读，补全对话。
A.
What are they doing
B.
She is my sister
C.
Hi Li Yan: Hello, Lynn. Lynn: ____________, Li Yan. Li Yan: Look at the girl. Who (谁) is she? Lynn: ____________. And the boy is my brother. Li Yan: Oh, ____________? Lynn: They are playing.
【单选题】仔细阅读，补全对话。
A.
mine
B.
Sorry
C.
skirt A: Look, it's a new skirt. Is it your ____________? B: No, it isn't. It's not ____________. A: Whose skirt is it? B: ____________. I don't know.
【简答题】由于创新必须具有“成果效益”,因此大多数创新是 系统性 的活动,往往需要依靠多人的群体合作,而不是单个的创造者来完成。
【单选题】仔细阅读，补全对话。
A.
colour
B.
short
C.
doctor A: Is your mother a teacher or a ______________? B: She is a doctor. A: Is she tall or short? B: She is ______________. A: What ______________ is her hair? B: Her hair is black.
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