与正方体ABCD-A1B1C1D1的三条棱AB、CC1、A1D1所在直线的距离相等的点①有且只有1个;②有且只有2个;③有且只有3个;④有无数个,其中正确答案的序号是( )。
④
边长为2的正方形的面积为a,边长为b的立方体的体积为27,则a﹣b的值为[ ]
A.29
B.7
C.1
D.﹣2
To prevent gastroesophageal reflux in a client with hiatal hernia, the nurse should provide which discharge instructions
A.Lie down after meals to promote digestion.
B.Avoid coffee and alcoholic beverages.
C.Take antacids before meals.
D.Limit fluids with meals.