固定桥按形式分类可分为
A．简单固定桥
B．双端固定桥
C．复杂固定桥
D．单端固定桥
E．复合固定桥
参考答案：B,D,E
一批砂经测定细度模数为2.85，则该批砂为( )。
A．粗砂 B．中砂C．细砂 D．粉砂
Distinguished guests and friends, welcome to our school, the ceremony of the 50th Anniversary this morning are our alumni （校友） from home and abroad.
A．Attend
B．To attend
C．Attending
D．Having attended
