作三角形连接的三相对称负载,均为RL串联电路,且R=10Ω,XL=XC=5Ω,当相电

题型:单项选择题

问题:

作三角形连接的三相对称负载,均为RL串联电路,且R=10Ω,XL=XC=5Ω,当相电流有效值为IP=1A时,该三相负载的无功功率Q=()。

A.15Var

B.30Var

C.40Var

D.0Var

考点:一级注册结构工程师一级结构师基础知识一级注册结构工程师基础部分上午试卷
题型:单项选择题

根据下列句子及所给汉语注释,写出空缺处各单词的正确形式(每空只写一词)。

1. In the city, the water ______ (管子) in some buildings cracked and burst.

2. In fifteen terrible seconds a large city lay in ______ (废墟).

3. But how could the survivors believe it was natural? Everywhere they looked near everything was ______

    (破坏).

4. I am fond of my sister but she has one serious ______ (缺点). She can be really stubborn.

5. Water, food, and electricity were hard to get. People began to wonder how long the ______ (灾难) would

    last.

6. Two years ago she bought an expensive mountain bike and then she ______ (说服) me to buy one. And so

    I did.

7. The task was difficult, but Helen's ______ (坚决的) expression let me know that she would not give up.

8. Although many Americans move a lot, they still _______ (辨认出) and understand each other's dialects.

9. Sadly, I am only able to look at nature through dirty ______ (窗帘) hanging before very dusty windows.

10. ______ (青少年) like to gossip, and they often see something that isn't real.

题型:单项选择题

某6岁的患儿需行气管内插管术(经口),其气管导管应选用()

A.25号

B.28号

C.30号

D.32号

E.36号

题型:单项选择题

成型机电控柜内所通气体为()。

A、低压蒸汽

B、氮气

C、仪表空气

D、工厂空气

题型:单项选择题

抗病毒药不包括()

A.酮康唑

B.阿昔洛韦

C.氟胞嘧啶

D.利巴韦林

E.阿糖腺苷

题型:单项选择题

手工(人力机械)结鞭,每人定量()kg。

A、1

B、2

C、3

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