指出下列哪个因素为职业性致畸因素
A.铅
B.甲基汞
C.苯
D.一氧化碳
E.二氧化碳
参考答案:B
解析:妇女妊娠前3个月为胚胎器官形成期,职业接触甲基汞可致胎儿畸形。
氮气有哪些性质和用途?
()is software about the relation between the customer and the supplier in marketing.
A.Customer Relationship Management
B.Customer service
C.Sales planning
D.Distribution channel