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【单选题】
为了考察两个变量x和y之间的线性相关性,甲、个同学各自独立地做10次和15次试验,并且利用线性回归方法,求得回归直线分别为L1和L2。已知在两个人的试验中发现对变量x的观测数据的平均值恰好相等,s,对变量y的观测数据的平均值也恰好相等,t。那么下列说法正确的是A.
直线L1和L2有交点(s，t)
B.
直线L1和L2相交，但是交点未必是点(s，t)
C.
直线L1和L2由于斜率相等，所以必定平行
D.
直线L1和L2必定重合
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举一反三
【单选题】 403.直流快速开关的动作时间仅 2ms ,全部分断电弧也不超过( ) ms ,适用于中、大容量整流电路的严重过载和直流侧短路保护。
A.
15~20
B.
10~15
C.
20~25
D.
25~30
【单选题】In The Sorrows of Empire, Chalmers Johnson advances the disturbing claim that the United States' Cold War-era military power and far-flung base system have, in the last decade, been consolidated in a ...
A.
Revolving around a center body.
B.
have no orbit of their own.
C.
dependent.
D.
smaller than others.
【简答题】Mrs. Chalmers was kind of fat: Her hair was pretty blonde and her complexion was soft and pink and she always looked as though she had been in the beauty parlor all afternoon.
【单选题】The author's opinion about the remark of Chalmers Johnson in The Sorrows of Empire might be best summarize as one of______.
A.
surprising but somewhat reasonable.
B.
reasonable but still needs to be improved.
C.
too absolute.
D.
too pessimistic.
【简答题】符合墙面抹灰踢脚线、墙裙粉刷的要求有一般墙面抹灰到接近地面时必须做墙裙外墙用和脚线内墙用收口、脚线、墙裙面比墙抹灰面凸出10～15mm、墙裙的高度一般为500～700mm、脚线的高度一般为（）。
【单选题】Mrs. Chalmers was kind of fat: Her hair was pretty blonde and her complexion was soft and pink and she always looked as though she had been in the beauty parlor all afternoon.
A.
松散句
B.
掉尾句
C.
平衡句
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