若一个立方体的主视图与左视图都是等腰三角形,俯视图是圆,那么这个图形可能是 [ ]
A.圆锥
B.圆台
C.圆柱
D.三棱锥
答案:A
若函数f(x)是定义在R上的偶函数,在(-∞,0]上是增函数,则使得f(x)<f(2)的x取值范围是( )
A.(-∞,2)
B.(2,+∞,)
C.(-2,2)
D.(-∞,-2)∪(2,+∞)
Which of the following statements is NOT true about John McDermott
A.John McDermott was one of 15. men that entered the first Boston Athletic Association Marathon.
B.John McDermott was the first winner in the history of Boston Marathon.
C.An attendant rubbed John McDermott' s leg so as to get over the leg cramps.
D.John McDermott ranked 683rd in last year's Boston Marathon.