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【简答题】
如图所示为某同学在实验中设计的线路,图中有三只相同规格的白炽灯(220V,60W)和一台电动机(铭牌上标注380V∕220V、Y∕Δ)。看懂简图,回答下列问题: (1)合上供电开关QS1,若S1、S2闭合,则中性线上有电流吗? (2)合上供电开关QS1,S1、S2、S3都闭合式,若中性线断开,三只白炽灯能否正常发光? (3)电动机正常工作时绕线电压是多少?该同学连接的正确吗?
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【单选题】下列加粗词与例句中的词意思相同的是 ( ) 例句:我总觉得他说话不大漂亮,非自己插嘴不可。 A.父亲忽然看见两位先生在请两位打扮漂亮的太太吃牡蛎。 B .这件事办得很漂亮。 C.这件衣服不大漂亮。 D.这房间布置得很漂亮
A.
1
B.
2
C.
3
D.
4
【单选题】为了提高齿根抗弯强度,可 ______ 。
A.
增大模数
B.
保持分度圆直径不变而增加齿数
C.
采用负变位齿轮
【单选题】Choose the best answer according to the listening you have heard.
A.
After you, please.
B.
Take care.
C.
This way, please.
D.
Sure, I will.
【判断题】我国铁路标准钢轨类型有75 kg/m、60 kg/m、50 kg/m、43 kg/m、38 kg/m等(中级线路工用)。
A.
正确
B.
错误
【单选题】为了有效地提高齿根抗弯强度,可()。
A.
增大模数
B.
保持分度圆直径不变而增大齿数
C.
采用负变位齿轮
【单选题】Teaching Poetry No poem should ever be discussed or 'analyzed', until it has been read aloud by someone, teacher or student. Better still, perhaps, is the practice of reading it twice, once at the beg...
A.
discuss it with others.
B.
analyze it by oneself.
C.
it down in a notebook.
D.
Practise reading it aloud.
【单选题】为了提高齿根抗弯强度,可()
A.
增大模数
B.
保持分度圆直径不变而增大齿数
C.
采用负变位齿轮
【简答题】Choose an appropriate determiner to fill in each of the blanks:Have you got ________copies to go round?A. the other B. enough C. a little D. much
【单选题】Teaching Poetry No poem should ever be discussed or 'analyzed', until it has been read aloud by someone, teacher or student. Better still, perhaps, is the practice of reading it twice, once at the beg...
A.
to discuss it with others
B.
to analyze it by oneself
C.
to hear it read out
D.
to practice reading it aloud
【简答题】为什么说社会主义文化建设是社会主义现代化的重要保证?
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