溶液流完后管尖端接触瓶内壁约（）秒后，再将移液管和吸量管移去。
A.5
B.10
C.15
D.20
参考答案：C
I don’t quite understand what you said. Would you please give us ______example?
A．others
B．other
C．the other
D．another
哈金斯参数
