热传递的方式有哪几种?
参考答案:
有对流、传导、辐射三种。
物质名称与化学式不相符合的是( )
A.汞:Hg
B.甲烷:CH4
C.硝酸:HNO3
D.胆矾:CuSO4
()links all suppliers and customers as a chain in a certain product or service.
A.Contract
B.Business agreement
C.supply chain
D.network