线路纵断面两相邻坡段的连接点称为（）。
参考答案：变坡点
Mr. Green to the manager now. You'd better call him later. [ ]
A. talk
B. talked
C. is talking
D. was talking
根据汉字国标码GB 2312-1980的规定，总计有各类符号和一级、二级汉字个数是( )。
A．6763个
B．7445个
C．3008个
D．3755个
