吹灰器与管道连接时，螺栓不要拧得过紧，适当的扭矩为（）。
参考答案：240牛顿•米
Bats are surprisingly long-lived creatures, some________ a life span of around 20 years.[ ]
A. having
B. had
C. have
D. to have
中国药典规定“冷处”系指
A．0℃
B．0～2℃
C．2～5℃
D．2～10℃
E．-2～2℃
