单项选择题

淘宝默认对于快下架的产品会给与展现较好的权重，而周期是（）天。 A.
4 B.
5 C.
6 D.
7

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新民主主义社会中的社会主义因素不包括（）。

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单项选择题

Regarding to the polarization , which statement as follows is right?
A、The vector lines of start with positive charges, and end with negative charges.
B、The vector lines of start with positive free charges, and end with negative free charges.
C、The vector lines of start with positive bound charges, and end with negative bound charges.
D、The vector lines of start with negative bound charges, and end with positive bound charges.