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【单选题】
注射机的注射成型系统主要是由( )等组成。 1料斗 2料筒 3喷嘴 4传动装置 5注射座移动油缸 6注射油缸 7计量装置A.
①②③④⑤⑥⑦
B.
①②③④
C.
④⑤⑥⑦
D.
①③⑤⑦
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