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【单选题】
电路如图所示, 欲使该电路维持正弦等幅振荡,若电阻R1=100K,则反馈电阻 RF的阻值应为( )。A.
100K
B.
200K
C.
300K
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【单选题】听力原文：M: Hi, would you like some help? W: Well, I'm looking for something I saw at a friend's house a few days ago. He said he bought it here. It's a light metal shelf almost a yard long with a magneti...
A.
A cabinet.
B.
A refrigerator.
C.
A light.
D.
A shelf.
【单选题】听力原文：M: Hi, would you like some help? W: Well, I'm looking for something I saw at a friend's house a few days ago. He said he bought here in your store. It's a bright metal shelf, almost a yard long a...
A.
At a furniture store.
B.
At a big department store.
C.
At a biologist laboratory.
D.
Near a factory which produces metal shelf.
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【单选题】听力原文：M: Hi, would you like some help? W: Well, I'm looking for something I saw at a friend's house a few days ago. He said he bought it here. It's a bright metal shelf, almost a yard long, with a magn...
A.
In a kitchen.
B.
At a department store.
C.
In the woman's laboratory.
D.
At the woman's house.
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