不能出现LOOP和EXIT语句的程序结构是( )。A．IF...”．ENDIF B

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问题单项选择题

不能出现LOOP和EXIT语句的程序结构是( )。

A．IF...”．ENDIF

B．SCAN...ENDSC州

C．D0…．ENDDO

D．FOR...ENDFOR

答案

参考答案：A

填空题

选择正确答案填空。

1. Li Ming are getting ready (A. for B. to) school.

2. Mitts and mittens are meaning (A. different B. the same).

3. Look (A. out B. on) of the window.

4. I like to ski (A. on B. in) the snow. Let's go (A. inside B. outside).

5. I have (A. a B. two) sticks (A. for B. at) the snowman's arms.

多选题

A．变压器输出功率为200W

B．若n₁=100匝，则输出端线圈的磁通量变化率的最大值为2Wb/s

C．副线圈两端的电压表示数20V

D．变压器的输入功率是由发电厂的输出功率决定的