如图所示,理想变压器的原、副线圈匝数比为1:5,原线圈两端的交变电压为u=,氖泡

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问题:

如图所示,理想变压器的原、副线圈匝数比为1:5,原线圈两端的交变电压为u=,氖泡在两端电压达到100 V时开始发光。下列说法中正确的有

[ ]

A.开关接通后,氖泡的发光频率为100 Hz

B.开关接通后,电压表的示数为100 V

C.开关断开后,电压表的示数变大

D.开关断开后,变压器的输出功率不变

考点:变压器电压、电流、电功率与匝数的关系
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动词填空(共10题; 每小题0.5分,满分5分)

小题1: With Daniel ___ (leave) in charge, his parents went abroad to spend vacation as planned.

小题2:The model teacher has devoted all her life to teaching her students, and she deserves  _________ (respect).

小题3:On ___(hear) the news of the air attack most foreigners headed for the border.

小题4:John ____________(regret be )careless as he failed in the physics examination again.

小题5:He sat on his bed, looking at Mary, who had her arms __________ (cross) and looked angry.

小题6: They insisted on ______ (send) to the countryside to work with the farmers.

小题7:They are supposed _____(finish) at least half of the work, but they didn’t.

小题8:The proud look on his face suggested that he _____(pass) the final examination successfully.

小题9:All the workers are forbidden ___________(smoke) in that company.

小题10:I can’t watch TV tonight, Jack. Please keep me __________ (inform) of the present situation of the Europe.

题型:不定项选择

24岁初孕妇,孕39周,双胎妊娠临产,第一胎儿娩出后等待15分钟无宫缩,则下一步处理是()

A.剖宫产

B.静滴缩宫素

C.人工破膜

D.会阴侧切术

E.胎头吸引术

F.产钳助产术

题型:不定项选择

能够将表单的Visible属性设置为T并使表单成为活动对象的方法是 ______。

A.Hide

B.Show

C.Release

D.SetFocus

题型:不定项选择

发起设立的股份有限公司全体发起人的首次出资额不得低于公司注册资本的()。

A.20%

B.25%

C.30%

D.35%

题型:不定项选择

若以钳式电流表测量单相交流风扇马达之运转电流,应以何种方法取得正确的电流值()

A.同时以钳测量两条电源线之电流值除以2

B.以钳测量一条电源线之电流值

C.以钳测量任一条导线电流值后除以该导线之股数

D.以钳逐一测量两条电源线之电流值后相加

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