非淋菌性 * * 炎男性 * * 分泌物涂片镜检,以油镜下每视野查到多形核白细胞数为多少个对诊断有意义()
A.≥3
B.≥5
C.≥10
D.≥15
E.≥20
参考答案:B
下列地质灾害中,主要由外力作用导致的是( )
A.日本神户地震
B.菲律宾皮纳图博火山喷发
C.云南东川泥石流
D.唐山大地震
Timmy goes to school _____ every day. It's 5 minutes' walk from his home to school .[ ]
A. in a bus
B. by MTR
C. on foot
D. by tram