医技人员在为患者做检查时，应做到（）
A.减少人为干扰因素
B.发现危急值应立即通知临床医师
C.建立记录册，做好完整记录
D.以上均是
参考答案：B
若A点坐标为（1，1），F1是5x2＋9y2=45椭圆的左焦点，点P是椭圆的动点，则|PA|＋|P F1|的最小值是_______ ___
A garden is surrounded by a path that is 4 feet wide. What is the area of the path (1) The area of the path is
of the area of the garden. (2) The garden is circular with a 12-foot diameter.
of the area of the garden.