总延伸系数等于各道次延伸系数之（）
A.和
B.平方和
C.乘积
参考答案：C
Linda didn’t get there on time because of the bad weather. What’s more, her car
was in poor .
A．position
B．condition
C．situation
D．direction
使用装岩（煤）机必须遵守下列规定
