心导管检查血氧含量右心房高于上、下腔静脉的先天性心脏病是

A．房间隔缺损

B．空间隔缺损

C．动脉导管未闭

D．肺动脉狭窄

E．法洛四联症

To prevent a wooden hull from leaking you caulk it（）.

A.after drydocking，while the hull is moist

B.after drydocking，and the hull has dried

C.afloat，where it is leaking

D.afloat，in all accessible areas