将盐酸溶液分为两等份，分别放在天平左右两边烧杯中，天平平衡后，向左、右两边各加入质量相同的两种粉末，充分反应后，天平仍保持平衡，但左盘粉末有剩余，而右盘粉末全部反应完。则左、右两边加入的粉末可能是（ ）
| A．左CaCO3、右MgCO3 | B．左K2CO3、右CaCO3 |
| C．左MgCO3、右CaCO3 | D．左KHCO3、右CaCO3 |
相关试题
more, and you'll improve your spoken English.
| A． | Speak | B． | Speaks | C． | Speaking | D． | To speak |
--- I've just got a postcard from my pen friend.
--- Let me have a look
. Wow.nice card!
| A． | What | B． | What a | C． | How | D． | Why |
--- What is your favourite sport?
--- Swimming, I think. It's of all.
| A． | earsier | B． | more difficult | C． | the most interesting | D． | the most boring |
---I use your ruler, Lingling?
--- Sure. Here you are.
| A． | May | B． | Would | C． | Need | D． | Must |
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