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关于野生植物贸易的限制规定不正确的是()
某种气体的摄氏温度为35℃,那么它的绝对温度为()K。
已知如图所示的文丘里管流量计,管的直径d1=6cm,d2=2cm,1断面与喉管断面的测压管水头差为Δh=8cm ,如果文丘里管流量计流量修正系数μ=0.98,求管路中通过流量Q为多少?(不计水头损失)
约束是阻碍物体运动的一种装置吗?
关于风险型CM模式,下列说法正确的有()。
支配股内收肌群的神经是( )。
物体受四个互不平行的力作用而平衡,其力多边形是()
一棵生长了50多年的大树能生产出()双筷子。
带上车的较重物品、锐器、杆状物品、玻璃制品等应放于()。
女,82岁,体重45kg。术前诊断为股骨颈骨折,拟行人工股骨头置换术。既往史高血压10年,慢性支气管炎30年。术前检查发现肥厚性梗阻性心肌病,无自觉症状;ECG正常;UCG显示室间隔增厚(14mm),左室流出道血流速度增快,与左室流出道之间的最大压差为40.4mmHg,左室舒张功能减低。未用术前药。静脉诱导用异丙酚90mg+芬太尼50μg+琥珀胆碱100mg,气管内插管;维持麻醉用异氟醚+N2O/O2吸入,间断静脉注射芬太尼和维库溴铵。术中行直接动脉压测定,连续监测ECG、SpO2、尿量等。术中血压波动明显,低血压期间采用数次血管活性药物,血压维持120~150/60~80mmHg。术毕患者清醒,拔管。术后恢复良好。 术中血压波动,出现血压下降时宜先选用哪种升压药()。
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