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【单选题】
两根无限长平行直导线载有大小相等方向相反的电流I,并各以dI/dt的变化率增长,一矩形线圈位于导线平面内(如图),则:A.
线圈中无感应电流
B.
线圈中感应电流为顺时针方向
C.
线圈中感应电流为逆时针方向
D.
线圈中感应电流方向不确定
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反馈参考答案：
举一反三
【单选题】The new manager had a bad cold, and _________ couldn’t come to the party.
A.
besides
B.
because
C.
however
D.
therefore
【单选题】— What’s the matter with you? —I had bad cold and had to stay in bed.
A.
a; /
B.
a; the
C.
a; a
D.
the; the
【单选题】The reason (why) Jack (failed) to (attend) the lecture is (because) he had a bad cold.
A.
why
B.
failed
C.
attend
D.
because
【单选题】--Is Jim at school today? -- No, he's at home ______ he has a bad cold.
A.
because
B.
if
C.
though
D.
until
【单选题】在基本共射电路中,基极偏置电阻 的作用是 。
A.
限制基极电流，使晶体管工作在放大区，并防止输入信号被短路
B.
把基极电流的变化转换为输入电压的变化
C.
保护信号源
D.
防止输出信号被短路
【简答题】I had my meals brought to me when I was ill in bed with a bad cold．
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