特发性肺纤维化最主要的临床表现是()
A.难以缓解的咳嗽
B.隐袭性进行性呼吸困难
C.长期低热
D.持续性胸痛
E.间歇性咯血
参考答案:B
Whitman has made radical changes in the form of poetry by choosing free verse as his medium of expression. What are the characteristic of Whitman’s free verse
水下电缆相互间严禁( ),相邻电缆应保持足够的安全间距。
A.交叉;
B.重叠;
C.平行;
D.连接。