向NaBr、NaI的混合溶液中通入足量Cl2，然后加热将溶液蒸干并灼烧，最后残留的物质是
| A．NaCl | B．NaCl、NaBr、NaI |
| C．NaBr、NaI | D．NaCl、I2 |
相关试题
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| A．continued | B．immediate | C．careful | D．general |
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| A．as | B．if | C．though | D．unless |
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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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