在冬季可以往齿轮油中掺兑煤油或柴油，以降低凝点，从而保证正常润滑
参考答案：错
at the news that his eyes rained tears.
A．So was Tom sad
B．So sad was Tom
C．So sad Tom was
D．So Tom was sad
循证医学的主要应用包括（）
A.药物研究
B.行政决策
C.临床决策
D.疾病分布研究
E.管理医疗
