单开道岔中,尖轨前第一拉杆的中心位置距尖轨实际尖端()。
A.330mm
B.380mm
C.490mm
D.510mm
参考答案:B
When Michael Phelps won another gold medal at the National Aquatics Center, _____ was likely that
his dream of getting 8 gold medals at the Beijing Olympic Games was to be realized.[ ]
A. which
B. that
C. it
D. he
关于闭塞性周围动脉粥样硬化,叙述不正确的是()
A.好发于男性
B.好发于青年人
C.好发于下肢动脉
D.与冠心病的危险因素相同
E.行走疼痛-休息-缓解是其病程中一个典型的临床表现