配送是一种"中转"形式。配送是从物流结点到用户的一种送货形式。
参考答案：对
How long ______ you ______ here since you ______ to Beijing?[ ]
A. did; live; came
B. did; live; have come
C. have; lived; came
D. have; lived; have come
当地层倾角不陡，横向速度变化不大的一些地区，宜采用（）偏移方法。
A.绕射叠加偏移
B.有限差分偏移
C.频率波数偏移
