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【判断题】
龟甲冬青是 灌木,多分枝,单叶互生,密,椭圆形至长倒卵形,叶面凸起。A.
正确
B.
错误
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举一反三
【单选题】A vessel displaying three red lights in a vertical line is ______.
A.
restricted in her ability to maneuver
B.
not under command
C.
engaged in mineclearing operations
D.
constrained by her draft
【简答题】样品极差为（ ）。
【单选题】Which of the following is NOT the concern of the author?
A.
The comparison between the abilities of men and women directors.
B.
The difficulty of recruiting women directors in the business.
C.
The solutions to increasing the number of women directors.
D.
The advantages of recruiting women directors from outside the business world.
【简答题】极差法确定测量值的实验标准差的公式为s(xk)=R/C,其中C表示()。 (A)自由度 (B)极差 (C)极差系数 (D)相关系数
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