螺纹连接是一种可装拆的固定连接。它具有结构简单、连接可靠、装拆方便迅速等优点。
参考答案：对
Last summer when we were holidaying in Scotland,our children preferred________in the wild
________in a hotel. [ ]
A. to camp; to live
B. to camp; to living
C. camping; to living
D. camping; to live
下列哪个是阿片受体的特异性拮抗药
A．美沙酮 B．纳洛酮 C．芬太尼 D．曲马朵 E．烯内吗啡
