【单选题】不必提取质粒DNA进行酶切鉴定,而是直接以菌体热解后的DNA为模板进行PCR扩增的鉴定阳性克隆的方法是()
【多选题】在平直公路上,甲乘汽车以10m/s的速度运动,乙骑自行车以5m/s的速度运动,则下列说法正确的是( )
A.
从同一点同时出发且同向运动时,甲观察到乙以5m/s的速度远离
B.
从同一点同时出发且同向运动时,乙观察到甲以5 m/s的速度靠近
C.
从同一点同时出发且反向运动时,甲观察到乙以15 m/s的速度远离
D.
从同一点同时出发且反向运动时,乙观察到甲以15 m/s的速度靠近
【单选题】口对口人工呼吸时,先连续大口吹气两次,每次( )
【简答题】Balancing work and school was difficult. “ I was staying up la Balancing work and school was difficult. “I was staying up late studying, and going to work early every morning. I was having a hard time...
【单选题】口对口人工呼吸时,先连续大口吹气两次,每次()
【单选题】在BIOS主菜单中有关于设置密码的选项是( )。
A.
BIOS Security Features
B.
Boot Configuration Features
C.
Advanced Bios Features
D.
Power Management Features
【单选题】口对口人工呼吸时,先连续大口吹气两次,每次( )秒
【单选题】口对口人工呼吸时,先连续大口吹气两次,每次( )
【单选题】在平直的公路上,甲乘汽车以 10 m/s的速度运动,乙骑自行车以5 m/s的速度运动,甲、乙的运动方向相同,甲在前,乙在后,则( )
【单选题】I was so tired then that I fell ____ in class.