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【单选题】
数控铣床在加工过程 ,NC 系统所控制的总是 ( )A.
刀具中心的轨迹
B.
刀位点的轨迹
C.
零件轮廓的轨迹
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反馈参考答案：
举一反三
【单选题】Which of these statements is NOT true, according to the reading passage? Their journeys were long, tiring and often dangerous, so ______.
A.
they had to arm themselves with wooden sticks
B.
they protected themselves with stone clubs
C.
they had to travel in groups
D.
they never traveled at night
【单选题】— May I park my car here? — No, you ______. No car is allowed to park here.
A.
may not
B.
needn't
C.
mustn't
D.
daren't
【单选题】Firefighters are often asked to speak to school and community groups about the importance of fire safety,particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in...
A.
install smoke detectors in the homes of residents in the community.
B.
check homes to see if smoke detectors have been properly installed.
C.
develop fire safety programs for community leaders and school teachers.
D.
speak to school children about the importance of preventing fires.
【单选题】Firefighters are often asked to speak to school and community groups about the importance of fire safety,particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in...
A.
50% better chance of surviving a fire.
B.
50% better chance of preventing a fire.
C.
75% better chance of detecting a hidden fire.
D.
100% better chance of not being injured in a fire.
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