举高车垂直支腿悬空不受力时，检测开关前端面距离支腿上平面距离应大于（）mm。
A.8.0
B.10.0
C.15.0
D.20.0
参考答案：B
— __________ are singers.
— My father is _____. [ ]
A. Tom and Jim's fathers; a singer and an actor
B. Tom and Jim's father; a singer and actor
C. Tom's and Jim's father; a singer and an actor
D. Tom's and Jim's fathers; a singer and actor
直线y=kx+b与y=2x图象平行，且经过点（0，-2），则这条直线与x轴的交点是______．
