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【简答题】
已知 U ab =5V , a 点电位为 -12V ,那么 b 点电位为 V 。
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举一反三
【单选题】I _____ her carefully, but I _____ nothing. [ ]
A.
listened; heard
B.
listened to; heard
C.
heard; listened
D.
heard; listened to
【单选题】Rarely ______ such a silly thing.
A.
have I heard of
B.
I heard of
C.
I have heard of
D.
have I been heard of
【单选题】Rarely________such a silly thing。
A.
have I heard of
B.
I have heard of
C.
have I been heard of
D.
I have heard
【简答题】童年期儿童游戏属于( )。 (A)动游戏 (B)象征性游戏 (C)实物游戏 (D)规则游戏
【单选题】This morning I heard (on the radio) (which) the steel industry has decided (to give) its employees a (10% raise) in pay.
A.
on the radio
B.
which
C.
to give
D.
10% raise
【单选题】I have heard a warning ____ the radio that a storm may be ____ its way.
A.
on;on
B.
over;in
C.
on;above
D.
form;on
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