室间隔缺损伴明显肺动脉高压时可有以下临床表现，但应除外

A．右心室显著增大

B．原有心脏杂音明显增强

C．P2亢进

D．肺动脉段明显突出

E．右心室压力明显升高

For determining the amount of chains used in anchoring operation,which one of the following factors wouldn’t be considered?（）.

A.selection of landmarks

B.character of sea bottom

C.strength of current and wind force

D.radius of ship swing to wind or tide