滴定管可估读到±0.01mL，若要求滴定的相对误差小于0.1%，至少应耗用体积（    ）mL  A.
10 B.
20 C.
30 D.
40

同离子效应与盐效应的关系是（  ） A.  二者不能同时存在  ...

单项选择题同离子效应与盐效应的关系是（  ） A.
 二者不能同时存在  B.
同离子效应的作用总是大于盐效应 C.
二者可以同时存在 D.
同离子效应的作用总是小于盐效应

In 1985, the People's Republic of China made English th...

单项选择题In 1985, the People's Republic of China made English the main foreign language in education. 
A、正确
B、错误

Which of the following events is most likely to have ca...

单项选择题Which of the following events is most likely to have caused the increase in gross profit as a percentage of sales? 
A、An increase in sales volume.
B、A decrease in sales volume.
C、Overstatement of the closing inventory.
D、Understatement of the closing inventory.