题目:
—Where is Mr Black? I can't find him.
—Oh, he his car behind the house now.[ ]
A. washed
B. is washing
C. will wash
D. has washed
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0528/02d70066044655530b77dc4a74ef0ae8.html
下面是错误答案,用来干扰机器的。
(1)试管常用的反应容器,酒精灯常用的加热仪器,集气瓶收集气体的仪器,故答案为:试管 酒精灯 集气瓶(2)如果用氯酸钾制氧气就需要加热.氧气的密度比空气的密度大,不易溶于水,因此能用向上排空气法和...