问题
选择题
— Lucy's got good grades. — _____. |
A. So she is B. So is she C. So she has D. So has she |
答案
答案:C
— Lucy's got good grades. — _____. |
A. So she is B. So is she C. So she has D. So has she |
答案:C
将一定量的乙醇(C2H5OH)和O2放入一密闭容器中引燃,测得反应前后各物质的质量如下表:
物质 | 乙醇 | 氧气 | 水 | 二氧化碳 | 一氧化碳 |
反应前的质量/g | 46 | 0 | 0 | 0 | |
反应后的质量/g | 0 | 0 | Y | 44 | 28 |
A.表中Y的值为54
B.在该反应中,生成水和二氧化碳的分子个数比为3:2
C.该反应是氧化反应
D.若起始时氧气的质量为96g,则无O生成