从原油中分离出汽油、煤油、柴油的操作是蒸馏操作。
参考答案：对
-Please sit down and I'll cook you some coffee.
-________.Let's come to the point first.[ ]
A．You are welcome
B．You needn't do so
C．Please don't bother
D．You are indeed too polite
神经根型颈椎病是（）。
A.Froment试验
B.Dugas征
C.Eaton试验
D.Thomas征
E.Mills征
