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【单选题】
--- If he ____, he _____ that food. --- Luckily, he was sent to hospital immediately.A.
was warned; would not eaten
B.
had been warned; would not have eaten
C.
would be warned; had not eaten
D.
would have been warned; had not eaten
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【简答题】标准的机床坐标系是一个 。
【简答题】标准的机床坐标系是一个______坐标系，其Z轴方向是______的方向。
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