单项选择题

入磨物料粒度和水分对物料的粉磨没有直接影响。

A.正确
B.错误

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单项选择题

Endogeneity is the central topic of Chapter _______.
A、6
B、7
C、9
D、None of the above.

单项选择题

Every Easter Sunday, the president of the United States holds an annual Easter egg hunt on the White House lawn for young children.

A．对
B．错