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【单选题】
一电热器接在 10 V 的直流电源上 , 产生的热功率为 P 。把它改接到另一正弦交变电路中 , 要使其产生的热功率为原来的一半 , 如果忽略电阻随温度的变化 , 则该交变电流的电压最大 ( 峰 ) 值应等于 ( )
A.
5V
B.
14V
C.
7.1V
D.
10V
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参考答案:
举一反三
【单选题】He lives in a room ______ and 5 meters wide.
A.
10 meters long
B.
10 meter long
C.
long 10 meters
D.
10-meter-long
【判断题】La2B1022两个频率相同的正弦量的相位差为180°,叫做同相。
A.
正确
B.
错误
【单选题】He lives in a room, _____ window face south
A.
whose
B.
of which
C.
its
D.
of it
【单选题】He lives in the room____window faces to the south.
A.
that
B.
which
C.
whose
D.
of which
【单选题】He lives in a room ______ window faces south.
A.
whose
B.
who
C.
whom
D.
that
【简答题】He lives in a small room with only one small window.英译汉
【简答题】He lives in a room __________ window faces the north.
【单选题】He lives in the room____window faces to the south.
A.
whose
B.
who
C.
which
D.
that
【单选题】两个同频率的正弦交流量的相位差为180°,则两正弦交流量为( )。
A.
同相
B.
反相
C.
一致
D.
同步
【单选题】He lives in the room, the window_____faces to the south.
A.
that
B.
which
C.
whose
D.
of which
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