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【简答题】
控制两台三相异步电动机星三角启动与运行。按下启动按钮 SB1 ,第一台电动机将三相定子绕组接成星形接线启动 8s ,再将三相定子绕组接成三角形; 10s 后启动第二台电动机,第二台电动机将三相定子绕组接成星形接线启动 6s ,再将三相定子绕组接成三角形。停止时,按下停止按钮 SB2 ,两台电动机立即停止。
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举一反三
【单选题】The plane _____________ its usual route.
A.
kept from
B.
deviated from
C.
precluded from
【单选题】( )5. Tom went to work early______. A. as usual B. than usual C. as usual as
A.
as usual
B.
than usual
C.
as usual as
【简答题】Many television viewers take him as their (favor)______ actor.
【简答题】A. groups B. audiences C. samples D. viewers
【单选题】The usual form of the denomination is a number, ________ preceded or followed by a currency symbol.
A.
necessarily
B.
compulsorily
C.
inevitably
D.
optionally
【简答题】There are also viewers who argue that this will be harmful because ______ .
【简答题】Part B Below is a graph showing the distribution in the number of film viewers and television watchers in a certain city. Look at the graph and write an essay of about 120 words reference to th...
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