鉴定是否有质粒转入受体菌的方法是()
A.耐药性选择
B.逆转录作用
C.免疫学方法
D.分子杂交
参考答案:A
The car _____ by the policeman because the driver was drunk.[ ]
A. stopped
B. was stopped
C. were stopped
氧气瓶内的压力降至()时,不准再使用,用过的瓶上写明()。