一定量的盐酸跟过量的铁粉反应时，为了减缓反应速率，且不影响生成氢气的总量，可向盐酸中加入适量的
①NaOH固体 ②H2O ③NH4Cl固体 ④CH3COONa固体 ⑤NaNO3固体 ⑥KCl溶液
| A．②④⑥ | B．①② | C．②③⑤ | D．②④⑤⑥ |
相关试题
The CDs are on sale! Buy one and you get ______ completely free. 
| A． | other | B． | others | C． | one | D． | ones |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
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