肠道致病菌的特征是()
A.抗原结构复杂,均有H、O抗原
B.在鉴别培养基上为有色不透明菌落
C.多数分解乳糖
D.可根据形态染色特征鉴定分型
E.革兰阴性杆菌
参考答案:E
Look! Some women are chatting ______ over there and the rest _____ looking at the pictures.[ ]
A. happy, is
B. happily, is
C.happily, are
D. happy, is
起吊分油机的机架罩时所用吊链每根的长度不应少于()米。