题目内容
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提问人:网友fjlycfq
发布时间:2022-01-07
[主观题]
(Reduce pollution and zero emission / Reduce pollution and decrease emission) are two important thoughts in the concept of green chemistry.
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A.rotating cam
B.lever
C.brake shoe
D.rotor
A、$7.
B、$9.
C、$10.
D、$11.
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