华支睾吸虫的中间宿主是()
A. 钉螺
B. 扁卷螺
C. 纹绍螺
D. 土蜗螺
E. 萝卜螺
患者,男,30岁。颈部肿块,溃后脓水清稀,夹有败絮样物,经久不敛。应首先考虑的是
A. 发
B. 瘰疬
C. 颈痈
D. 失荣
E. 无头疽
The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuating _____.
A. bending stresses
B. torsion stresses
C. shear stresses
D. All of the above
家兔和欧洲野兔最为易感,呈季节性发生,在蚊子大量滋生的季节是发病高峰季节,还有周期性趋向,每8~??10年流行一次的是()??
A. 兔巴氏杆菌病
B. 坏死杆菌病
C. 兔腹泻杆菌病
D. 兔肝片吸虫病
E. 兔黏液瘤病