垂直放置的矩形平板,一側(cè)擋水,該平板由置于上、下邊緣的拉桿固定,則拉力之比T1/T2應(yīng)為:()
A.1/4 B.1/3 C.1/2 D.1
A.4mH2O B.6mH2O C.3.5mH2O D.2mH2O
A.5at B.0.5at C.98kPa D.40kPa