问题
选择题
_____ are my sister's pencils and _____ my ruler.[ ]
A. Those; that
B. These; that's
C. This; that's
D. That; this is
答案
答案:B
_____ are my sister's pencils and _____ my ruler.[ ]
A. Those; that
B. These; that's
C. This; that's
D. That; this is
答案:B
如图所示,甲为盛有水的烧杯,试管乙直插入甲容器的水中( 试管未碰底 )。甲烧杯受到酒精灯持续加热后,发现乙试管内的液体沸腾起来了,根据下表提供的有关信息,可判断试管乙内的液体一定是: 。
几种物质的沸点(1个标准大气压)
物质 | 沸点(℃) | 物质 | 沸点(℃) |
水 | 100 | 甘油 | 290 |
煤油 | 150 | 酒精 | 78 |