下列各组中的两物质相互反应时，产物不随反应条件（温度、反应物用量比等）改变而改变的是
| A．Na和O2 | B．Ca(OH)2和CO2 | C．NaOH和HCl | D．Na2CO3和HCl |
相关试题
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 |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
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