问题
选择题
—____ she got a nice dress?
—Yes, she _____. [ ]
A. has, does;
B. Does; Does
C. Has; has
D. Does; has
答案
答案:C
—____ she got a nice dress?
—Yes, she _____. [ ]
A. has, does;
B. Does; Does
C. Has; has
D. Does; has
答案:C
一个密闭容器中加入甲、乙、丙、丁四种物质,在一定条件下发生化学反应,测得数据见下表.下列说法中正确的是( )
物质 | 甲 | 乙 | 丙 | 丁 |
反应前质量 | 8g | 35g | 5g | 8g |
反应后质量 | 2g | X | 5g | 42g |
A.丁可能是化合物
B.在该反应中,丙物质一定做催化剂
C.该反应是化合反应
D.在该反应的化学方程式中,甲、乙的化学计量数之比为3:l4