女性,48岁,发热,咳嗽1周。黄脓性痰,有臭味,每日约50ml。无拔牙史,皮肤无疖肿,既往体健。X线胸片示右下肺近心缘处大片浓密阴影,距膈约1.5cm处有一2.5cm×3.3cm空洞伴液平面,内壁光整,空洞不偏心,侧位病灶位于下叶前段和内侧段,近似三角形。该患者初步诊断为() ["A.右下肺炎","右下肺脓肿","右下肺结核","右下肺癌伴继发性肺脓肿","左下肺支气管扩张症"]
有φ75.9mm油管内容积是4.525m3/km,该油管的长度890m,其内容积是多少?(取整数)
周代,人们按四时祭祀祖先,夏祭叫() ["礿","禘","尝","烝"]
某井井内φ25mm抽油杆,在提抽油杆时遇卡,卡点距井口20m。预计上提200kN的拉力,问:能否将抽油杆提断?P=δbxπ/4xφ2(φ25mm抽油杆钢材的强度极限δb=530MPa)
最危险的多瓣膜病见于() ["主动脉瓣关闭不全伴二尖瓣关闭不全","二尖瓣狭窄伴三尖瓣和(或)肺动脉瓣关闭不全","二尖瓣狭窄伴主动脉瓣关闭不全","主动脉瓣狭窄伴二尖瓣关闭不全","二尖瓣狭窄伴二尖瓣关闭不全"]
某井下φ56mm管式抽油泵,泵上为φ62mm油管,泵挂1600m,试压时打压10MPa。问:油管因打压产生的拉力是多少?(精确到小数点以后三位数)