灌瓶嘴是在钢瓶灌装上，启闭液化石油气通路的工具。
参考答案：错
－Shall we go and have a picnic at the weekend?
—________ It is said there might be snow then.
A．Why not?
B．It sounds great!
C．Well, I can’t agree with you more．
D．That depends．
不属于四环类的抗生素是
A．多西环素B．米诺环素C．土霉素D．四环素E．红霉素
