菌痢特异性预防有效方法是()
A.注射免疫球蛋白
B.注射菌苗
C.口服SMZCO
D.口服“依链株”痢菌活菌苗
E.口服痢特灵
参考答案:D
In the past few years, sea ice ____ in the Arctic as a result of global warming.
A.had melted
B.has been melting
C.melted
D.is melting
现浇柱与基础连接用的插筋,其箍筋应比柱的箍筋缩小一个插筋直径,以便连接。( )