人体皮肤是化工生产中有毒有害物质侵入人体的主要途径。
参考答案:对
Experienced as she is, the teacher is still thinking of new ideas about how the new textbooks should be ______ .
A.conducted
B.made
C.sent
D.carried
每个工单受理后都必须设置()。工单审核和工单处理时,需要根据该设置进行优先级排序。