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【单选题】
以 Yi表示实际观测值,Yi^ 表示预测值,则普通最乘法估计参数的准则是 ( )A.
∑(Yi-Yi^)2=0
B.
∑(Yi-Y―)2=0
C.
∑(Yi-Yi^)2最小
D.
∑(Yi-Y―)2最小
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【单选题】What a____ it is for the two Johnson sisters to fall in love .with the two Hans brothers!
A.
distinction
B.
coincidence
C.
fashion
D.
relationship
【简答题】卫星星历的数据来源有（）和（）两类。
【单选题】What can be concluded from the passage?
A.
Amy Johnson was the first pilot to fly to Australia all by herself.
B.
Amy Johnson's parents were rich and generous.
C.
Amy Johnson was the first woman who owned an airplane.
D.
Amy Johnson's dream came true.
【单选题】In what situation does Johnson commit a tort of negligence?
A.
Johnson leaves a campfire with a desire to burn down the forest.
B.
Johnson carelessly leaves a campfire burning, but it burns out.
C.
Johnson carelessly leaves a campfire burning, but it burns out, and then lightning causes a fire that burns down the forest.
D.
Johnson carelessly leaves a campfire burning, and the fire spreads to burn down the forest.
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