下列物质中不能作为固体分散体的载体是
A．有机酸类B．无机盐类C．表面活性剂D．纤维素及衍生物E．高分子聚合物
参考答案：B
The world will live happier lives if people have ________ better understanding of ________ idea of harmonious globe.
A．the; a
B．/; the
C．a; an
D．a; the
A special device that，when fitted into the rotary table，transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make the hole is called a（）.
A.master bushing
B.kelly slips
C.kelly bushing
D.rotary bushing
