题目

30.They can’t afford to buy the latest equipment at present._______,they keep trying new ways to improve efficiency.        A.On the contrary       B.In contrast   C.Nevertheless       D.Furthermore 答案:C常温下,一个体积变化可以忽略不计的物体悬浮在一个开口且装满水的容器里静止不动,下列哪种情况,物体会上浮到水面A.大气压强增大时B.大气压强减小时C.水温升高时D.水温降低时
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