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【单选题】
变频器所采用的制动方式一般有能耗制动、回馈制动、( )等几种。 A、失电制动 B、失速制动 C、交流制动 D、直流制动A.
1
B.
2
C.
3
D.
4
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反馈参考答案：
举一反三
【简答题】试说明交流发电机定子绕组断路检测?
【单选题】The proposal____, we’llhave to make another decision about when to stat the project.
A.
accepted
B.
accepting
C.
to accept
D.
be accepted
【单选题】When one of the pair becomes interested in someone else, the marriage is most likely to break up.
A.
Right
B.
Wrong
C.
Not mentioned
【多选题】when/else与switch/case有以下几点区别:
A.
关键宇switch被when取代。
B.
判断语句“case 常量值:”被新语句“常量值 ->”取代。
C.
每个分支后面的break语句取消了,因为Kotlin默认一个分支处理完就直接跳出多路语句,所以不再需要break。
D.
关键宇default被else取代。跟优化后的if/else一样,Kotlin中的when/else也允许有返回值。
【单选题】Rachel babysits for her sister for no pay. When she babysits for someone else she charges $8 an hour. When is Rachel's babysitting included in GDP?
A.
When she babysits for her sister and when she babysits for someone else.
B.
When she babysits for her sister, but not when she babysits for someone else.
C.
When she babysits for someone else, but not when she babysits for her sister.
D.
Neither when she babysits for her sister nor for someone else.
【单选题】可用欧姆表检查交流发电机的定子总成,下列哪一项是正确的测试方法和正确的判断?( )
A.
接一块欧姆表在交流发电机的一根定子导线和定子外壳间,读数过大说明有短路故障。
B.
将欧姆表接在任何两根定子导线间,读数无穷大表明绕组断路。
C.
将一块电流表到滑环上,低的驱动电流表示绕组有短路。
D.
接一块电流表在一个绕组上,低的读数表示绕组没有断路。
【简答题】When one of the pair becomes interested in someone else, the marriage is most likely to
【单选题】Please do not()when somebody else is talking.
A.
intend
B.
interpret
C.
interrupt
D.
invest
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