单项选择题关于选择合适的参比溶液： 若仅待测组分与显色剂反应产物在测定波长处有吸收，其它所加试剂均无吸收，用纯溶剂（水)作参比溶液； A、正确 B、错误
单项选择题The government has already proposed and introduced a package of plans to ________ negative impact of financial crisis.A、manage B、tackle C、cope D、deal
