供洗相用的硝酸银(AgNO3)溶液 ( )
参考答案:归税号2843.2100,和为20。
解析:本题中的AgNO3不按感光材料归类,应按溶液本身归类,28,43税目为优先品目。
The woman made his son ______ finally after she told him some jokes. [ ]
A. laughed
B. to laugh
C. laugh
D. laughing
拉米呋啶抗病毒的作用机制是()
A.抑制病毒增强子活性
B.降解病毒mRNA
C.清除细胞核内cccDNA
D.参与到HBV-DNA合成过程中阻止新链合成
E.竞争性抑制HBV-DNA聚合酶