日常维护保养的要求规定每年不少于（）次对电梯运行情况进行全面检查。
A.1
B.2
C.3
D.12
参考答案：A
--- So you gave her your phone ?
--- _____ ,she said she’d return it to me when she could afford her own.
A．Not exactly
B．My pleasure
C．No wonder
D．All right
上部接触式接触轨中心至相邻走行轨工作边的水平距离应为（）。
A.500mm
B.600mm
C.700mm
D.800mm
