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【单选题】
极板间为真空的平行板电容器,充电后与电源断开,将两极板用 绝缘工具 拉开一些距离,则下列说法正确的是 [ ] (A) 电容器极板上电荷面密度增加; (B) 电容器极板间的电场强度增加; (C) 电容器的电容不变; (D) 电容器极板间的电势差增大。A.
B.
C.
D.
D
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皮皮学刷刷变学霸
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【简答题】柑橘青绿酶病属于果蔬的( )病害。
【单选题】听力原文：Helen, do you know the manager's phone number? (3)
A.
No one is at home.
B.
You have got a wrong number.
C.
I have no phone at all.
D.
Sorry, I don't remember.
【单选题】— How are you, Mary? —___Helen.
A.
How are you?
B.
I’m fine. Thank you
C.
How do you do?
D.
Nice to see you
【单选题】听力原文：M: We've got three women researchers in our group: Mary, Betty and Helen. Do you know them? W: Sure. Mary is active and sociable. Betty is the most talkative woman I've ever met. But guess what? ...
A.
Helen is quiet.
B.
Helen is talkative.
C.
Helen is sociable.
D.
Helen is active.
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