动火作业分类中不包括()。
A.特殊危险动火作业
B.一级动火作业
C.二级动火作业
D.一般动火作业
参考答案：D
The boy was sitting ___ his mother, ___ his back ___the door. [ ]
A. next to; with; to
B. nearly; of; against
C. close to; with ;on
D. near; in; towards
怎样确定销售渠道的长度
