水结成冰后,体积是变大了还是变小了?
答:水结冰前后质量不变化,水的密度大于冰的密度,根据公式V=可知,体积会变大.解决此类问题要知道水和冰的密度不同,但结冰前后质量不变.
________ Saturday, rather than ________ at home, I preferred ________.[ ]
A. It being; stay; to travel
B. Being; to stay; to travel
C. Having been; stay; traveling
D. It was; to stay; traveling
()明确提出了无产阶级领导权问题。
A.中共一大
B.中共二大
C.中共三大
D.中共四大