OTDR测试仪使用时常用的折射率是:()
A.1.4675
B.1.4670
C.1.4672
D.1.4672
参考答案:A
能同时启动内源性和外源性凝血途径的DIC的是()。
A.羊水栓塞
B.急性早幼粒细胞白血病
C.广泛创伤
D.大型手术
E.严重感染
During daylight savings time the meridian used for determining the time is located farther().
A.east
B.west
C.east in west longitude and west in east longitude
D.west in west longitude and east in east longitude