男性，72岁，排尿困难2年，有终末排尿痛，1月前因尿潴留，留置导尿7天，拔除尿管后仍排尿困难。肛诊前列腺Ⅰ°增生；B超可见中叶向膀胱内突出4cm左右，膀胱内有结石3cm，双肾无积水，心肝功好，其最佳治疗（）

A.耻骨后膀胱外前列腺切除术

B.经膀胱前列腺切除术

C.膀胱造瘘

D.前列腺 * * 支架网置入

E.留置导尿管

Which mooring line prevents sideways motion of a vessel moored to a pier（）.

A.A line led forward from the bow

B.A line led aft from the bow

C.A line led in the same direction as the keel

D.A line led at a right angle to the keel