下列各项中可致长期慢性咳嗽的是
A．急性咽喉炎
B．支气管异物
C．支气管扩张症
D．百日咳
E．气管肿瘤
参考答案：C
简述旋流布料墙的施工办法？
Forty-five fathoms is marked on the anchor chain by（）.
A.one turn of wire on the first stud from each side of the detachable link
B.two turns of wire on the second stud from each side of the detachable link
C.three turns of wire on the third stud from each side of the detachable link
D.four turns of wire on the fourth stud from each side of the detachable link
