非特异性抗心律失常药物的活性大小在同一系列化合物中与什么有关
A．极性取代基B．油水分配系数C．立体构型D．芳香环类型E．氨基部分
参考答案：B
— Are you sure the delegation will come to our school next week?
— _____. The head of it has just emailed me about the departure time of their flight.
A．No wonder.
B．You bet.
C．Don’t mention it.
D．Definitely not.
启动钻机时，至少有（）人合作。
A、2
B、3
C、4
