1. [单选题]海上求生者为维持生命，每人每天至少应补充淡水：
A. 2.5升
B. 0.5升
C. 1.5升
2. [单选题]flag
A. 标志
B. 旗帜
C. 旗语
D. 军旗
3. [单选题]An additive used to improve the ability of a lube oil to reduce friction is known as a/an
A. suppressant additive
B. dispersant additive
C. extreme pressure additive
D. viscosity improver additive
