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【判断题】
增益可调的放大电路如图所示。【图片】是增益调节电位器。已知【图片】【图片】【图片】，A为理想运算放大器。当【图片】的动端在中间时，输出电压【图片】＝0.5V。（）【图片】A.
正确
B.
错误
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举一反三
【简答题】I don’t know whether you happen_______, but I’m going to study in the U.S.A. this September. A. to be heard B. to be hearing C. to hear D. to have heard
【单选题】I don’t know whether you happen ____ it, but I’m going to study in the U.S.A. this September. A. to be heard
B.
to be hearing
C.
to hear
D.
to have heard
【简答题】若有定义 String to="I am a good cat";则to.indexOf("a",7)的值为( )
【单选题】I don't know whether you happen ______ , but I'm going to study in the U.S.A.this September.
A.
to be heard
B.
to be hearing
C.
to hear
D.
to have heard
【简答题】I’m going to check up ______the time of the train.
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