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【单选题】
If you feel sympathy ________ them, you'd better try your best to help them.
A.
for
B.
up
C.
from
D.
with
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刷刷题刷刷变学霸
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【单选题】对于六极三相异步电动机,如其额定频率为50Hz,其同步转速是( )r/min。
A.
1500
B.
1000
C.
750
D.
3000
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【单选题】直流电动机能耗制动时,串入附加电阻越大,制动转矩越大,制动越快。
A.
正确
B.
错误
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【单选题】Some of the volcanoes have lain here peacefully for _______ sky-blue lakes have formed in their craters.
A.
longer than
B.
so long that
C.
as long as
D.
such long as
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【单选题】Mark Messier is the NHL player who has ________ the biggest fortune, with his hockey salary, over the last 12 seasons.
A.
collected
B.
gathered
C.
assembled
D.
accumulated
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【单选题】The house next door is being sold — the sign "________" went up yesterday.
A.
For Sale
B.
On Sale
C.
In Sale
D.
Up Sale
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【单选题】电磁转矩与转速方向一致,也就是电磁转矩拖动转子旋转时,电机处于( )状态。
A.
发电机
B.
无法确定
C.
制动
D.
电动
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【单选题】The president has been criticized by his Republican opponents for delaying a decision on the ______ increase.
A.
soldier
B.
power
C.
force
D.
troop
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【单选题】I always make sure I keep ________ of all the money I spend.
A.
track
B.
out
C.
hold
D.
balance
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【单选题】To measure temperature, we have to ________ some kind of suitable temperature scale.
A.
pick
B.
seek
C.
choose
D.
elect
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【单选题】My uncle gave the _________ of his collection of antiques to the city museum.
A.
bulk
B.
most
C.
major
D.
main
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