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【单选题】
现代飞机上普遍采用的三相馈电线连接形式是A.
机体为中线的三相四线制
B.
不接中线的三相三线制
C.
单相为主而兼有三相的供电系统
D.
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反馈参考答案：
举一反三
【单选题】To ____ your dream of becoming a scientist, you must work hard from now on.
A.
turn
B.
recognize
C.
live
D.
change
【单选题】You must work hard from now on, ?
A.
can you
B.
won’t you
C.
mustn’t you
D.
needn’t you
【单选题】In order to _______ your goals, you must work hard.
A.
make
B.
achieve
C.
require
D.
develop
【单选题】You must work hard,____ you will not learn English well.
A.
if
B.
whether
C.
otherwise
D.
unless
【单选题】If you want to succeed ,you must work hard and ____you should be sure of success.A．after allB．abo
A.
26.If you want to succeed ,you must work hard and ____you should be sure of success. A．after all
B.
above all
C.
in all
D.
all in all
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