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【单选题】
一台变比为k=10的变压器,从低压侧作空载实验,求得副边的励磁阻抗标值为16,那末原边的励磁阻抗标值是 。A.
16
B.
1600
C.
0.16
D.
160
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【单选题】It's parents' duty to keep their kids alert to strangers who leave unpleasant impressions on them.
A.
Y
B.
N
C.
NG
【简答题】A．Put the homework on Don's desk. B．Leave the key for Don. C．Give Don's students the next assignment. D．Call Don at the end of the afternoon.
【单选题】_______ always succeed. [ ]
A.
Honest and clever students
B.
Students who honest and clever
C.
Honest students and clever
D.
Students are honest and clever
【简答题】液体定量灌装,首先想到的定量设备是( )。生活中类似的设备名称( )
【简答题】在更换制动系统零部件时,制动液压管路可能会进入空气,制动分泵上有______,用于排放空气。
【简答题】A．Put the homework on Don's desk. B．Leave the key for Don. C．Give Don's students the next assignment. D．Call Don at the end of the afternoon.
【单选题】Students who leave school in the spring and look for work are one source of ________.
A.
structural unemployment
B.
cyclical unemployment
C.
frictional unemployment
D.
business-cycle fluctuations
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