轨道的木枕垫板置于轨底与木枕之间。
参考答案：对
The building, from _____ top visitors can enjoy a good view of Sanya, attracts hundreds of tourists every day.[ ]
A. which
B. whose
C. its
D. where
下列哪项因素与休克Ⅱ期血管扩张无关（）
A.酸中毒
B.组胺
C.5-羟色胺
D.腺苷
E.激肽
