The ____________ is in the bathroom. [ ]
A. refrigerator
B. stove
C. shower
答案:C
鱼鳃进行气体交换的部位是 [ ]
A.鳃盖
B.鳃丝
C.鳃耙
D.鳃弓
牺牲阳极保护法的依据是:()
A.钝化机理
B.成膜理论
C.线性极化理论
D.电偶腐蚀原理