()是承载和传递信息的工具。
A、报纸
B、电视
C、媒体
D、以上都不对
参考答案:C
混凝土养护时间宜为()d。
A.5~6
B.8~10
C.10~13
D.14~21
Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?()
A.Salinity of water
B.Temperature of water
C.Atmospheric pressure
D.Type of bottom