1. [单选题]关于液压系统的油箱下列说法错误的是( )。
A. 内壁的防锈涂层应能与油相容
B. 内有隔板高至油面2/3高度
C. 容积为泵每分钟排量的1~2倍,以利散热和分离气体与杂质
D. 底部宜成凹型,便于放油
2. [单选题]The International Oil Pollution Prevention Certificate is valid for a period of______.
A. one year from the date of issue
B. five years from the date of issue
C. three years from the date of issue
D. four years from the date of issue