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
—Have you been to the Great Wall?
—Perhaps not in my memory.________,it might have been during my early childhood.
A.If any
B.If so
C.If ever
D.If not
根据充气式轮胎工作压力的大小又分为高压轮胎、()、超低压轮胎。