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【单选题】
标准差，亦称均方差，是指分布数列中各单位标志值与其平均数的离差的平方的算术平均数的平方根。( )A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】离别是这样甜蜜又悲伤,我要对你说再见一直说到大天亮。
A.
Parting is so sweet sorrow that I shall say good night till it be morrow.
B.
Parting is such sweet sorrow that I shall say good night till it be morrow.
C.
Parting is such sweet sorrow that I shall say good night till it will be morrow.
D.
Parting is so sweet sorrow that I should say good night till it be morrow.
【单选题】All of following descriptions are true of the wall of large artery EXCEPT( )
A.
The tunica adventitia is thick and the outer elastic membrane is obvious.
B.
Subendothelial layer contains smooth muscle cells
C.
Tunica media contains a large number of elastic membranes and a small amount of smooth muscle
D.
Boundary between tunica intima and tunica media
E.
There are vasa vasorum in tunica adventitia
【单选题】tunica media of large artery cmposed by:
A.
collagen fibers
B.
elastic fibers
C.
reticular fibers
D.
collagen fibril
E.
collagen fiber bundles
【简答题】Describe the structures of large artery and medium-sized artery.
【单选题】the most differece between large-artery and medial-sized artery is:
A.
the thick of tunica intima
B.
the consist of tunica media
C.
the thick of tunica adventitia
D.
have internal elastic membrane or not
E.
have external elastic membrane or not
【简答题】已知直线l 1 ：x+2y+1=0，l 2 ：-2x+y+2=0，它们相交于点A． （1）判断直线l 1 和l 2 是否垂直？； （2）求过点A且与直线l 3 ：3x+y+4=0平行的直线方程．
【简答题】There is a large amount of energy wasted due to friction. 英译汉
【单选题】the most different between large-artery and medial-sized artery is:
A.
the thickk of tunica intina
B.
the consist of tunica media
C.
the thick of tunica adventitia
D.
have internal elastic membrane or not
E.
have external elastic membrane or not
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