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【单选题】
如图所示电路, 变压器内阻及二极管正向电阻均可忽略不计, 设输出电压平均值 U O ( AV ) = 18V ,则变压器次级电压有效值 U 2 约为多少A.
18V
B.
20V
C.
15V
D.
24V
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反馈参考答案：
举一反三
【简答题】旅游活动的基本要素( )( )( )。
【单选题】His play was popular and every time ______about it, he owed his success to the support of his friends.
A.
talking
B.
talked
C.
to talk
D.
when talking
【单选题】离婚时，原为夫妻共同生活所负的债务，清偿时以（）。
A.
夫妻一方的个人财产清偿
B.
夫妻共同财产清偿
C.
离婚后由有偿还能力的一方的个人财产偿还
D.
家庭共同财产清偿
【单选题】It was more than he could bear when his old friend ______ him to accept a cigarette.
A.
invited
B.
urged
C.
persuaded
D.
agreed
【单选题】财政支出增长的弹性系数是指()。
A.
财政支出与GDP之比
B.
财政支出增长率与GDP增长率之比
C.
财政支出增长额占GDP增长额的比例
D.
当年财政支出与上年财政支出之比
【单选题】He would have finished his college education，but he had to________and find a job to support his family. [ ]
A.
quit
B.
decline
C.
depart
D.
reserve
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