过点M（-2，3），且垂直于x轴的直线方程为______．
∵直线过点M（-2，3），且垂直于x轴，∴直线的方程为x=-2．
故答案为x=-2．
how can you possibly miss the news ? It _____ on TV all day long.
A．has been
B．bad been
C．was
D．will be
除另有规定外，水溶性基质栓剂的融变时限为（）
A.15min
B.30min
C.45min
D.60min
E.75min
