[单选题]海上求生者为维持生命，每人每天至少应补充淡水：

正确答案 ：B

0.5升

[单选题]flag

正确答案 ：B

旗帜

[单选题]An additive used to improve the ability of a lube oil to reduce friction is known as a/an

正确答案 ：C

extreme pressure additive

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