对社会性投资建立的学生公寓,其为高校学生提供住宿服务所收取的租金收入,免征营业税。()
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男,26岁。左下颌智齿拟在局麻下拔除。若行翼下颌传导阻滞麻醉。操作要点中不正确的是()
A. 大张口
B. 翼下颌中点外侧
C. 对侧前磨牙区与中线呈45°
D. 与咬合平面平行
E. 进针2.5cm不必触及骨面,注药
Which of the following statements is TRUE concerning the po column of the vmstat command?()
A. The sys is high when po is high.
B. The po represents the number of page steals.
C. The low values usually indicate insufficient paging space.
D. The low values usually indicate sufficient memory for the load.