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【单选题】
求平面外一点到平面的距离,下列表示解题步骤正确的是( )A.
先在平面内取一条水平线和一条正平线，过点的水平投影作水平线在该面投影的垂线，过点的正面投影作正平线在该面投影的垂线。
B.
用换面法：新投影轴与平面的一条直线垂直，一次换面可求出平面外一点到平面的距离。
C.
先在平面内取一条水平线和一条正平线，过点的水平投影作水平线在该面投影的垂线，过点的正面投影作正平线在该面投影的垂线。然后包含平面的垂线作投影面的垂直面为辅助平面，求出垂足点。
D.
先在平面内取一条水平线或一条正平线，新投影轴与平面的水平线的水平投影垂直或与平面的正平线的正面投影垂直，一次换面后可求出平面外一点到平面的距离。然后再找出垂足点在原投影面上的投影并与点的对应投影相连接。
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