进行蒸压加气混凝土干密度、含水率和吸水率试验时需要用到的仪器设备有()
A、电热鼓风干燥箱
B、托盘天平或磅秤
C、钢板直尺
D、恒温水槽
参考答案:A, B, C, D
下列有关实验操作不正确的是 ( )
A.中和热的测定实验中用到的玻璃仪器有温度计、烧杯、环形玻璃搅拌棒
B.滴定管在使用前必须检验是否漏水
C.某次滴定后滴定管的读数为20.3ml
D.碱式滴定管不能量取盐酸的体积
It is the news ()most parents of the hope that there is a safe and socially approved road to a kind of life they themselves have not had, but their children can.
A.that deprive
B.that it deprives
C.that deprives
D.when it deprives