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【简答题】
造成离心泵内功率损失的原因有( )、( )、( )。
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【单选题】Dear, you need to by next week, to go to university at home or to go abroad.You are going on eighteen. OK, Mum. I am considering it.
A.
make an appointment     
B.
make a suggestion       
C.
make a decision
【单选题】门关闭后,门扇之间及门扇与立柱、门楣和地坎之间的间隙应尽可能小。由于磨损,间隙值允许达到()mm。
A.
4
B.
6
C.
8
D.
10
【简答题】在三相五线制供电系统中,一根相线与另外一根相线之间的电压称为 ____ 。通常国内该电压为 ____ V。一根相线与零线之间的电压称为 ____ 。通常国内该电压为 ____ V。
【单选题】—Would you like me to go to the dentist with you? —No, you______with me.
A.
need not to go
B.
need not go
C.
do not need go
D.
not need go
【判断题】门关闭后,门扇之间及门扇与立柱、门楣和地坎之间的间隙应尽可能小。
A.
正确
B.
错误
【单选题】EPIRB batteries must be clearly____ with their expiry date, the serial number and the identification code.
A.
noted
B.
written
C.
marked
D.
notified
【判断题】层门关闭后,门扇之间及门扇与立柱、门楣和地坎之间的间隙为12mm。
A.
正确
B.
错误
【单选题】载货电梯的层门关闭后,门扇之间及门扇与立柱、门楣和地坎之间的间隙应不大于( )mm。
A.
6
B.
10
C.
8
D.
12
【判断题】A serial number must be included in a certificate. ( )
A.
正确
B.
错误
【单选题】64, EPIRB batteries must be clearly____and the serial number identification code
A.
written IMN number
B.
marked with their expiry date
C.
noted with the ship name
D.
notified with the nationality
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