LF31T-40/3.5型螺杆压缩机负载运行时，油压力应大于（）MPa。 ["0.2","0.25","0.3","0.35"]
碰墙式二过一，一般两人的传球距离不超过（） ["5米","15米","30米","40米"]
29岁，婚后4年未怀孕，月经规律，月经来潮12小时子宫内膜活检为分泌期宫内膜，B超下通液输卵管通畅，丈夫精液常规正常，应进一步首选哪项检查（） ["宫腔镜检查","腹腔镜检查","性交后试验","X线腹平片","内分泌化验"]
按矿用三牙轮钻头的排气方式可分为（）种。 ["二","三","四","五"]
骨盆底外层肌肉不包括（） ["球海绵体肌","坐骨海绵体肌","会阴浅横肌","尿道括约肌","肛门外括约肌"]
边际效用
