对迟发性外伤性脑内血肿最有价值的检查手段为() ["头颅X线平片","脑血管造影","头CT","脑B超","以上都是"]
已知某风机的转子直径为φ900mm,转速为1000r/min,求转子外缘圆周速度?
急性肺炎的病程是() ["1个月以内","1~2个月","2~3个月","3~6个月","6个月至1年"]
睾丸()。 ["卵巢","阴蒂","前庭大腺","大阴唇","前庭球男、女生殖器官互为同源的是"]
一产妇临产10小时,肛查:宫口已开全,先露为头,棘下4cm,请问此时产力组成是下列哪种情况() ["子宫收缩力","子宫收缩力+腹肌收缩力","子宫收缩力+膈肌收缩力","子宫收缩力+腹肌收缩力+膈肌收缩力","子宫收缩力+腹肌收缩力+膈肌收缩力+肛提肌收缩力"]
已知一台风机主电机转速为2985转/分,增速箱的速比是1.914,求风机转子的转速为多少?