单项选择题
A.7B.8C.9D.10
A.14B.15C.18D.21
A.36B.50C.100D.400
A.6种B.8种C.9种D.12种
A.2519B.2520C.5039D.5040
A.75B.82C.88D.95
A.14辆B.21辆C.15辆D.22辆
A.10%B.15%C.20%D.25%
A.2√2+2B.2√2+1C.3D.2
A.27B.36.5C.50D.无法确定
A.60B.64C.80D.84