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【多选题】
关于滞回比较器,正确的描述有( )。A.
滞回比较器工作在开环状态
B.
滞回比较器有两个不同的阈值电压
C.
滞回比较器工作在正反馈状态
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皮皮学刷刷变学霸
举一反三
【单选题】Irene says: “you needn’t go out”. What does she mean?
A.
She is planning to do grocery shopping too.
B.
She can go out herself and do Amina’s shopping.
C.
Amina can do her grocery shopping online from home.
D.
Amina can can ask someone else to do her grocery shopping.
【单选题】—Ann has gone out. — ________ What time did she go?
A.
Well, isnt she?
B.
Yes, she has.
C.
No, she hasnt,
D.
Oh, has she?
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