— I must say it is the most delicious duck I have ever eaten. — __________. I'm glad you enjoyed it.
已知:6.4克铜与适量的浓硝酸反应,当铜完全溶解后,共收集到NO和NO2混合气体共2.24升(已折算为标准状况).求:
1996年,我国北方地区苹果价格大跌,并且出现滞销局面,造成这种现象的主要影响因素是( )