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【多选题】
下列说法中,正确的是( )。A.
数控机床按其伺服系统的控制方式可分为开环控制数控机床、半闭环控制数控机床和闭环控制数控机床。
B.
开环控制数控机床控制中,没有位置检测元件。
C.
半闭环控制数控机床控制中,将位置检测元件安装在驱动电动机的端部或传动丝杠端部,间接测量执行部件的实际位置或位移。
D.
闭环控制数控机床控制中,将位置检测元件直接安装在机床工作台上,用以检测机床工作台的实际位置。
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【简答题】陈述获得溶解热的方法和原理。 (可上传手写答案照片)
【简答题】A．File a lawsuit against the man. B．Ask the man for compensation. C．Have the man's apple tree cut down. D．Throw garbage into the man's yard.
【单选题】The old man was too poor _____ a room _____. [ ]
A.
have; to live
B.
to have; live
C.
to have; to live
D.
to have; to live in
【简答题】A．The man invites her out to have a dinner. B．The man comes to have dinner at her home. C．They go out to enjoy a jazz concert. D．They have a good conversation over coffee.
【简答题】A: Do your products sell ____? B: Yes, they do.
【简答题】We have the system of exploitation of man by man. [A] cancelled [B] abolished [C] refused [D] rejected
【简答题】A．The man is not going to have a second baby. B．The man might stay at home more and more. C．The baby girl takes after the man in the appearance. D．The man's colleagues have bought something as gifts.
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