题目内容

点(4,0,3)在空间直角坐标系的位置是

A. 在oy轴上
B. 在xoy平面上
C. 在xoz平面上
D. 在第一卦限内

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点M(2,−3,1)关于坐标原点o及平面xoy的对称点分别是

A. (−2,3,−1)及(2,3,1)
B. (−2,3,−1)及(2,−3,−1)
C. (2,−3,−1)及(−2,−3,−1)
D. (−2,−3,−1)及(2,−3,−1)

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（） is the method used to deliver a message.

A. Channel
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Country factors that can affect location decisions include the availability of skilled labor and supporting industries.( )