防腐的措施有哪些？
参考答案：
防腐的措施主要有：选用耐腐蚀材料；加缓蚀剂进行保护；涂防蚀层；阴极保护。
________ at failing in the maths exam, John wouldn't like to talk about it to his parents.[ ]
A. Disappointed
B. To be disappointed
C. Disappointing
D. Having disappointed
银行对客户办理结售汇业务应坚持（）原则。
A.实需
B.整体性
C.及时性
D.流动性
