When a bridge transmits an Ethernet frame, the Ethernet frame has （）.

A.the broadcast address for the its source address

B.the bridge's LAN address for its destination address

C.the bridge's LAN address for its source address

D.none of the above

主要成分为碳酸锌，煅后变为氧化锌的药物是（）

A.石膏

B.炉甘石

C.白矾

D.雄黄

E.砒霜