FCA是指货交承运人。它的风险与费用划分的界限是在出口国合同指定的地点货交买方指定的承运人时起。( )
参考答案：错
—Do you often go to school _____ bike?
—No, I often go there _____ foot. [ ]
A. by; by
B. by; in
C. on; on
D. by; on
炸药爆炸的主要特点是什么？
