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【单选题】
电路如图所示,稳压管的稳定电压 U Z =6V ,电源 U S =4V ,则负载 R L 两端电压 U o 为( )A.
10V
B.
6V
C.
-4V
D.
0V
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反馈参考答案：
举一反三
【单选题】正常人耳对声音频率的最敏感范围是
A.
20～20000 Hz
B.
100～6000 Hz C：1000～3000 Hz D．1000～10000 Hz E．5000～20000 Hz
【单选题】The author is concerned with ______.
A.
analyzing the psychology of children having difficulties to make friends
B.
explaining why some children can't make friends successfully
C.
introducing how to instruct children to make friends
D.
illustrating the role of parents to help children make friends
【单选题】_____ having some money raises our level of happiness, having too much money does not.
A.
While
B.
When
C.
As
D.
Until
【简答题】A．Having a good knowledge of its customs. B．Knowing some key people in tourism. C．Having been to the country before. D．Being able to speak Japanese.
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