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【多选题】
数量标志的方差A.
具有非负性
B.
一般大于平均差
C.
会受到极端值的影响
D.
具有平易不变的性质
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皮皮学刷刷变学霸
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【单选题】听力原文：W: What do you speak? M: Chinese. What about you, Lisa? W: I speak both English and French. Q: What does Lisa speak? (20)
A.
English.
B.
French.
C.
B and C.
【简答题】如图所示,一质量为 m 的物体 A 放在一与水平面成 q 角的固定光滑斜面上,并系于一劲度系数为 k 的轻弹簧的一端,弹簧的另一端固定.设物体沿斜面的运动中 , 在平衡位置处的初动能为 E K 0 ,以弹簧原长处为坐标原点,沿斜面向下为 x 轴正向,试求: (1) 物体 A 处于平衡位置时的坐标 x 0 . (2) 物体 A 在弹簧伸长 x 时动能的表达式.
【简答题】Getting the Message Read the following statements carefully and decide whether they are true (T) or false (F) according to the text. 1 New Year's Eve is the most impor tant celebration in the world. 2...
【判断题】When people have New Year's parties, they usually keep silent to show respect to others.
A.
正确
B.
错误
【判断题】when people have New Year's parties, they usually keep silent to show respect to others.
A.
正确
B.
错误
【判断题】When people have new year's parties, they usually keep silent to show respect to others.
A.
正确
B.
错误
【单选题】When people have New Year’s parties, they usually keep silent to show
e respect to others.
A.
T
B.
F
【判断题】4 When people have New Year's parties, they usually keep silent to show respect to others.
A.
正确
B.
错误
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