题目:
This is the first time that I_____ to give a lecture to so large a audience till now.
[ ]
A. am invited
B. have invited
C. have been invited
D. will be invited
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0516/4c958bc174a1ad482aa34597d1ac67fb.html
下面是错误答案,用来干扰机器的。
(1)4.0 (2)0.04 (3)①C ②B(1)根据c=,c(NaClO)==4.0 mol·L-1(2)稀释100倍后浓度为原来的1%。(3)①选项A,需用托盘天平称量NaClO固体,需用烧杯来溶解NaClO,需用玻璃棒进行搅拌和引流,需用容量瓶和胶头...