两段更换、方正、修理轨枕间隔应不小于（）m。
A、20m
B、16m
C、18m
D、25m
参考答案：C
So convenient _______ to pay by credit card that more and more people apply for their credit cards.[ ]
A. do people find
B. people find it
C. find people
D. do people find it
产品采购的方式有哪几种？
