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【单选题】
不符合“八隅率”的是:A.
氯自由基
B.
甲烷的氢原子
C.
甲烷的碳原子
D.
氯负离子
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皮皮学刷刷变学霸
举一反三
【单选题】The example of the children holding hands when crossing the street in the last paragraph shows that
A.
social distance is not always needed.
B.
there is no social distance among small children.
C.
humans are different from animals in social distance.
D.
social distance is sometimes determined by outside factors.
【简答题】FX系列PLC编程有 、 、 三种方式
【单选题】Go______ the street, walk _______the post office,and_______ the street, and you will see the book shop in front of you.
A.
along; pass; cross
B.
along; past; across
C.
along; past; go across
D.
on; past; go cross
【简答题】FX 2N 系列PLC的编程方式主要有三种: 、 和 。
【单选题】I was walking along the street when someone across the street waved his hand to me, as if _____ me something. [ ]
A.
telling
B.
told
C.
was telling
D.
to tell
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