资本主义工商业完成了全行业公私合营后，国家为照顾民族资本家的利益实行的一项基本政策是

下述哪个超声心动图检查结果，不支持肺心病的诊断

A．右肺动脉内径及右房增大
B．右室前壁增厚
C．右心内径≥20mm
D．左右心室内径的比值＞2

You have been towing astern and have just let go the tow.Your deckhands are pulling in and faking the towline by hand on the stern.The most dangerous action to take is to（）.

A.continue ahead at slow speed

B.continue ahead at half speed

C.stop your engines

D.back down on your engines

在立式车床上，一般用千斤顶支撑毛坯基准面，用等高块支撑已加工平面。( )

列举陈垣在历史文献学方面的成就。

感觉。