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【判断题】
数控铣床开机顺序应遵守先打开压缩空气开关,再打开机床电源,然后打开系统电源,最后待系统自检完毕后,旋转开急停按并复位。 A.√ B.×A.
正确
B.
错误
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【单选题】电路如图所示, 所有二极管均为理想元件，则D1、D2、D3的工作状态为（ ）。A.D1导通，D2、D3截止 B. D1、D2截 止,D3导通C. D1、D2截 止,D3导通 D. D1、D2、D3均截止【图片】
A.
A
B.
B
C.
C
D.
0
【单选题】Did it take him to get through the work?__________
A.
one and a half year
B.
B two Scores of days
C.
several hundred days
D.
four dozens weeks
【单选题】——______ did it take him to draw the horse? ——Half a week.
A.
How much
B.
How often
C.
How long
【简答题】黄河发源于青海。黄河流域(river basin)是中国古代文明的诞生地,也是中国早期历史上最繁荣的地区。17-6-3
【简答题】如图1-6,D 1 、D 2 为理想二极管。D 1 状态 ,D 2 状态 。 V AB = V
【单选题】— ______does it take him to come to work by train? — An hour. [ ]
A.
How often
B.
How long
C.
How far
【单选题】_____ does it take him to walk to the park every day? [ ]
A.
How far
B.
How often
C.
How long
D.
How much
相关题目：
【单选题】——______ did it take him to draw the horse? ——Half a week.
A.
How much
B.
How often
C.
How long
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