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【单选题】
设a,b,c是从平面四边形一个顶点到其余三个顶点的有向线段表示的向量, 则方程xa+yb+zc=0 的图象为:
A.
空集
B.
一个点.
C.
一条直线.
D.
一个平面
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【单选题】Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. Afte...
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【单选题】Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. Afte...
A.
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