需要用倒链向外拉鹅颈管时，必须拴好逮子，手拉葫芦挂在（）逮子上，严禁挂在（）吊上。
参考答案：环梁；锚头
Though some foreign scientists had a ______ opinion of his new invention, his fellow workers never thought ____ of it.
A．highly; low
B．low; high
C．high; highly
D．poor; highly
我国的道路运输行政管理是按（）行政管理机构运作的。
A.三级
B.四级
C.五级
D.六级
