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【单选题】
PLC的CPU的工作电压一般为( )A.
DC5V
B.
DC24V
C.
AC24V
D.
AC220V
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反馈参考答案：
举一反三
【判断题】When the youth was challenged to bring their mores up to date, it was tempted, to escape its responsibilities and retreat behind an air of naughty alcoholic sophistication and a pose of Bohemian immor...
A.
正确
B.
错误
【单选题】Cross scavenging requires the fitting of _____to prevent air or exhaust gas escape when the piston is at the top of the stroke.
A.
an exhaust valve
B.
a piston skirt
C.
a piston crown
D.
an air suction valve
【简答题】简述石膏修整机的用途和操作方法。
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