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【单选题】
如上图所示,B1为自耦变压器,HT为高压变压器,SC(1,2)、SC(3,4)为摄影预备接触器常开触点,RD1为熔断器,SCR1、SCR2为可控硅。关于接通HT初级,下列说法正确的是( )
A.
当摄影预备接触器SC线圈得电时，其常开触点SC（1,2）、SC（3,4）闭合，即可接通HT高压初级
B.
当摄影预备接触器SC线圈得电、且SCR1、SCR2在正弦交流电的零相位导通时才可以接通HT高压初级
C.
当摄影预备接触器SC线圈得电、且SCR1、SCR2在正弦交流电的90°相位导通时才可以接通HT高压初级
D.
当SCR1、SCR2在正弦交流电的零相位先导通，然后摄影预备接触器SC线圈得电后，其常开触点SC（1,2）、SC（3,4）闭合，才可以接通HT高压初级
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参考答案：
举一反三
【单选题】The central idea, or point, developed in any essay is called a .
A.
topic sentence
B.
central statement
C.
thesis statement
D.
important sentence
查看完整题目与答案
【多选题】定期还本家庭财产保险,又称家财两全险,其主要特点有( )。
A.
利息抵充保险费
B.
定期还本付息
C.
定期还本
D.
保险期限多样化
E.
保险范围广
查看完整题目与答案
【简答题】be become do encourage joined move pass spend work Grammar Complete the text below with a verb from the box in the correct tense-past or present perfect. I [填空1] BP as a graduate traine four ye...
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【单选题】学术委员会一般应由学院不同学科、专业的教授及具有正高级专业技术职务的人员组成,且有一定比例的( );学术委员会设主任委员一名,副主任委员若干名;主任委员由院长提名,学术委员会全体会议选举产生。学术委员会由学术委员会主任主持开展工作,学术委员会日常办事机构设在( )。
A.
骨干教师、科研处
B.
青年教师、教务处
C.
青年教师、科研处
D.
骨干教师、教务处
查看完整题目与答案
【简答题】be become do encourage joined move pass spend work Grammar Complete the text below with a verb from the box in the correct tense-past or present perfect. I [填空1] BP as a graduate traine four ye...
查看完整题目与答案
【单选题】The European Central Bank yesterday the document was genuine but refused to make any further comment.
A.
expected
B.
suggested
C.
confirmed
D.
concluded
查看完整题目与答案
【判断题】研究参数趋向多样化已成为消费者行为学发展的一个方向。
A.
正确
B.
错误
查看完整题目与答案
【单选题】when I got to the company, the meeting ____ for 5 minutes.
A.
had begun
B.
has begun
C.
has been on
D.
had been on
查看完整题目与答案
【单选题】The European Central Bank yesterday _______ the document was genuine but refused to make any further comment.
A.
expected
B.
suggested
C.
concluded
D.
confirmed
查看完整题目与答案
【简答题】5 Complete the sentences. ► It’s been a struggle, but I think the business will survive . 1 The company now has a 10 per cent ____ of the market. 2 I bought 1,000 ____ in that company. T...
查看完整题目与答案
相关题目：
【单选题】The central idea, or point, developed in any essay is called a .
A.
topic sentence
B.
central statement
C.
thesis statement
D.
important sentence
查看完整题目与答案
【多选题】定期还本家庭财产保险,又称家财两全险,其主要特点有( )。
A.
利息抵充保险费
B.
定期还本付息
C.
定期还本
D.
保险期限多样化
E.
保险范围广
查看完整题目与答案
【简答题】be become do encourage joined move pass spend work Grammar Complete the text below with a verb from the box in the correct tense-past or present perfect. I [填空1] BP as a graduate traine four ye...
查看完整题目与答案
【单选题】学术委员会一般应由学院不同学科、专业的教授及具有正高级专业技术职务的人员组成,且有一定比例的( );学术委员会设主任委员一名,副主任委员若干名;主任委员由院长提名,学术委员会全体会议选举产生。学术委员会由学术委员会主任主持开展工作,学术委员会日常办事机构设在( )。
A.
骨干教师、科研处
B.
青年教师、教务处
C.
青年教师、科研处
D.
骨干教师、教务处
查看完整题目与答案
【简答题】be become do encourage joined move pass spend work Grammar Complete the text below with a verb from the box in the correct tense-past or present perfect. I [填空1] BP as a graduate traine four ye...
查看完整题目与答案
【单选题】The European Central Bank yesterday the document was genuine but refused to make any further comment.
A.
expected
B.
suggested
C.
confirmed
D.
concluded
查看完整题目与答案
【判断题】研究参数趋向多样化已成为消费者行为学发展的一个方向。
A.
正确
B.
错误
查看完整题目与答案
【单选题】when I got to the company, the meeting ____ for 5 minutes.
A.
had begun
B.
has begun
C.
has been on
D.
had been on
查看完整题目与答案
【单选题】The European Central Bank yesterday _______ the document was genuine but refused to make any further comment.
A.
expected
B.
suggested
C.
concluded
D.
confirmed
查看完整题目与答案
【简答题】5 Complete the sentences. ► It’s been a struggle, but I think the business will survive . 1 The company now has a 10 per cent ____ of the market. 2 I bought 1,000 ____ in that company. T...
查看完整题目与答案
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