星形连接的对称三相电路中,线电压有效值是相电压有效值的倍,各线电压超前相电压30°

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问题:

星形连接的对称三相电路中,线电压有效值是相电压有效值的倍,各线电压超前相电压30°

考点:水轮机调速器机械检修工水轮机调速器机械检修工(高级)水轮机调速器机械检修工(高级)题库
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阅读理解。

     Jim found a job in a shop two years ago. Mrs.White, the shopkeeper trusts the able young man and

pays him more. He's happy and works harder.

     Once Jim knew a beautiful girl called Mable at a friend's party. They danced for several times and the

girl was deeply in love. But Mabel's parents didn't agree to marry their daughter to a poor young man.

So they began to travel in America and didn't let the girl come back to London. She wrote a letter to Jim

and told him about it.Of course the young man hadn't enough money to go to see her.He was so sad that

he began to drink.

     It was Saturday one day.Jim didn't go to work.He came to a bar and sat down to drink.Just then an

old friend of his came in.He asked him to drink with him.Crying, he told Mike all and the young man felt

sorry for him.After a while they were both drunk and left.

    Mike wanted to take his friend home.When they passed a zoo, they went in and walked to a cage in

which there were two tigers.Having seen them,a tiger roared (吼). Mike was afraid and said, "Let's go.

Let's go. It's dangerous to stand here."

     "I don't think so," said Jim."I'm watching TV now".

1.Where was Jim from?

A. America.        

B. France.      

C. Australia.      

D. England.

2.Madel's parents didn't agree to marry their daughter to Jim because _______.       

A. they decided to travel in America       

B. they made the girl study in America       

C. the young mall wasn't rich enough      

D. the young man worked in a shop

3.Jim went on standing by the cage because _______.        

A. he was watching TV there             

B. he wasn't afraid of the tigers     

C. he had drunk too much in the bar         

D. he wouldn't live in the world

题型:判断题

在恒温恒容的密闭容器中,发生反应3A(g)+B(g)xC(g)。

Ⅰ、将3molA和2molB在一定条件下反应,达平衡时C的体积分数为a;

Ⅱ、若起始时A、B、C投入的物质的量分别为n(A)、n(B)、n(C),平衡时C的体积分数也为a。

下列说法正确的是 [ ]

A.若Ⅰ达平衡时,A、B、C各增加1mol,则B的转化率将一定增大

B.若向Ⅰ平衡体系中再加入3molA和2molB,C的体积分数若大于a,可断定x>4

C.若x=2,则Ⅱ体系起始物质的量应当满足3n(B) =n(A)+3

D.若Ⅱ体系起始物质的量当满足3n(C) +8n(A)==12 n(B)时,可判断x=4

题型:判断题

下列案例中哪一项成立犯罪未遂?()

A.甲对胡某实施诈骗行为,被胡某识破骗局。但胡某觉得甲穷困潦倒,实在可怜,就给其3000元钱,甲得款后离开现场

B.乙为了杀死刘某,持枪尾随刘某,行至偏僻处时,乙向刘某开了一枪,没有打中,在还可以继续开枪的情况下,乙害怕受刑罚处罚,没有继续开枪

C.丙绑架赵某,并要求其亲属交付100万元。在提出勒索要求后,丙害怕受刑罚处罚,将赵某释放

D.丁抓住妇女李某的手腕,欲绑架李某然后出卖。李为脱身,便假装说:"我有性病,不会有人要。"丁信以为真,于是垂头丧气地离开现场

题型:判断题

下列哪项提示P波异常()

A.Ⅱ导联P波直立

B.Ⅲ导联P波双向

C.aVR导联P波倒置

D.aVL导联P波不明显

E.V5导联P波倒置

题型:判断题

井径曲线不允许停车对套管。

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