在温度不变、恒容的容器中进行反应2HI
H2+I2（正反应为吸热反应），反应物的浓度由0.1 mol·L-1降到0.06 mol·L-1需20 s，那么由0.06 mol·L-1降到0.036 mol·L-1所需时间为
（ ）
| A．等于10 s | B．等于12 s | C．大于12 s | D．小于12 s |
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 |
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| 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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