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【单选题】
下列电机中，没有电刷装置的电机是（）。A.
静止式自励同步发电机
B.
直流并励发电机
C.
三相线绕式异步电动机
D.
采用小型转枢式为励磁机的三相同步发电机
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【单选题】There is no evidenc_____________there is life on any other planet in the solar system.
A.
which
B.
that
C.
how
D.
where
【单选题】.---Tom plays computer games too much. --- That’s why his mother is __________ his eyesight.
A.
worried about
B.
surprised at
C.
interested in
D.
proud of
【单选题】B When Mary Moore began her high school in 1951, her mother told her, 'Be sure and take a typing course so when this show business thing doesn't work out, you'll have something to rely on.' Mary respo...
A.
She didn't achieve her ambition.
B.
She didn't take care of her mother.
C.
She didn't complete her high school.
D.
She didn't follow her mother's advice.
【单选题】某系统采用短作业优先的调度策略,现有作业序列:作业1(提交时间:8:00,运行时间1.50),作业2(提交时间:8:30,运行时间0.80)作业3(提交时间:9:00,运行时间0.10),作业4(提交时间:9:30,运行时间0.30),单位:小时,以十进制计。其平均带权周转时间为:( )
A.
4.65
B.
3.00
C.
5.52
D.
12.23
【单选题】It was ______the boy said he almost never did any exercise in the school______ the mother began to worry about his health.
A.
what; that
B.
that; how
C.
when; that
D.
that; that
【简答题】(send)______ the baby to bed, the mother began to work again.
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