一条测速垂线实测的流速为1.85m/s，流向偏角为12°，与其相邻的另一条测速垂线采用半深一点法（流速系数0.89）测速，测点流速为2.96m/s，流向偏角为10°，两条垂线间的部分面积为305m2，则该两条垂线间的部分流量为（）m³/s。

A、732

B、671

C、677

D、683

Which statement is TRUE concerning fuel vapors on a vessel（）.

A.Fuel vapors gather in the lowest portions of the vessel

B.Fuel vapors can only be ignited by an open flame

C.Vent outlets should be located above the level of the carburetor air intake

D.None of the above