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【单选题】
下列说法错误的是A.
在运动过程中,数控系统需要随时检测机床的坐标轴位置、行程开关的状态等
B.
操作者可以随时对机床的加工情况、工作状态进行观察、检查
C.
半闭环控制实现对最终输出的直线位移的闭环控制
D.
数控装置对输入的程序进行译码、运算处理,发出相应的控制信号,以控制机床的各部件的运动。
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举一反三
【单选题】The police searched everyone_______ at the party
A.
present
B.
for now
C.
at present
D.
is present
【单选题】Choose the similar word. The police searched the flat carefully for clues.
A.
looked for
B.
discovered
C.
entered
D.
examined
【单选题】The police searched the robber 's home , but there was nothing .
A.
to be seen
B.
to see
【单选题】The police searched the robber’s home, but there was nothing .
A.
to be seen
B.
to see
C.
seen
D.
being seen
【单选题】The police searched the building ______ but failed to find out where the bomb was.
A.
throughout
B.
fully
C.
altogether
D.
thoroughly
【单选题】When the police searched the village, they caught the two ____ that had stolen something from t
A.
272. When the police searched the village, they caught the two ____ that had stolen something from the shop. A．robbers
B.
thiefs
C.
thieves
D.
Pickpockets
【单选题】Police searched the house ______ the missing boy.
A.
in order to
B.
for
C.
of
D.
With
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