可以调节混凝土凝结时间、硬化性能的外加剂有( )。
A．泵送剂
B．速凝剂
C．早强剂
D．缓凝剂
E．防冻剂
参考答案：B,C,E
The man to whom we handed the forms pointed out that they had not been _____ filled in. [ ]
A. slightly
B. properly
C. regularly
D. eventually
使用推车式灭火器灭火时，将灭火器推至距火焰边沿2米处扑灭火灾。
