题干
Sang Lan was so seriously injured that she was ______ to a top hospital in New York.
A：rushed
B：rushing
C：going
D：gone
答案(点此获取答案解析）
A
一定质量的铜粉加入到100mL某浓度的稀硝酸中，充分反应后，容器中剩有m1g铜粉，此时共收集到NO气体448mL(标准状况)。然后向上述混合物中加入足量稀硫酸至不再反应为止，容器剩有铜粉m2g，则(m1－m2)为
