所谓()是指冷却液体不和密封端面接触,通过冷却水套或其它方法达到冷却目的。
A、直接冷却
B、间接冷却
C、冲洗
D、封油泵
参考答案:B
(2009·上海高考)David threatened ________ his neighbour to the police if the damages were not paid.
A.to be reported
B.reporting
C.to report
D.having reported
第一个被FDA批准的降血脂药是()
A.羧苄西林
B.苄星青霉素
C.乙琥胺
D.洛伐他汀
E.地西泮