按国家标准的规定，硅酸盐水泥的初凝时间应满足（）。
参考答案：不早于45min
Nissan's plants in Zhengzhou and Guangzhou, ________ operate in cooperation with Dongfeng Motor Corp., remained closed.
A．which
B．who
C．that
D．whose
按照海关有关规定，进出口货物的收发货人是纳税义务人。 ( )
