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【简答题】
什么是 Phylogenetic tree ?
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举一反三
【单选题】( )属于美国学院哥特式风格,为典型的“社交堂”。
A.
圣三一堂
B.
徐家汇天主堂
C.
沐恩堂
D.
国际礼拜堂
【单选题】可用直接法配制标准溶液的有
A.
HCl
B.
NaOH
C.
KMnO 4
D.
K 2 Cr 2 O 7
【单选题】A ship is the product of two main areas of skill, those of the ______ and the _______.
A.
naval architect, repair division
B.
repair division, naval architect
C.
marine engineer, repair division
D.
naval architect , marine engineer
【简答题】The US navy boarded an apparent pirate (海盗) ship in the Indian Ocean and kept 26 men for questioning, the navy said Sunday. The 16 Indians and 10 Somali men were aboard a traditional dhow (单桅三角帆船) tha...
【单选题】Which one is not true? .
A.
Two main areas of skill are involved in the construction of ship
B.
There are distinct divisions in responsibilities between naval architects and marine engineers
C.
Each ship will assume varying proportions according to its type
D.
Ships can be divided into different categories from different perspectives
【单选题】下列说法正确的是( )::
A.
平面点集的边界点一定是聚点.
B.
平面点集的孤立点一定是边界点.
C.
平面点集的内点不一定是聚点
D.
平面闭区域一定有界.
【单选题】7-3. 下列说法正确的是 ( )
A.
带正电的物体电势一定是正的
B.
电场强度为零的地方电势一定为零
C.
等势面与电场线处处正交
D.
等势面上的电场强度处处相等
【单选题】抛掷10次硬币,3次正面向上,下列说法正确的是(  )
A.
正面向上的频率是3
B.
正面向上的概率是0.3
C.
正面向上的频率是0.3
D.
正面向上的频数是0.3
【多选题】以下标准溶液可以用直接法配制的有( )。
A.
NaOH
B.
K 2 Cr 2 O 7
C.
Na 2 S 2 O 3
D.
HCl
【单选题】下图中的正方体、圆柱体和圆锥体的底面积相等,高也相等.下面说法正确的是(  )
A.
圆锥的体积是正方体体积的三分之一
B.
圆锥的体积是圆柱体积的3倍
C.
圆柱的体积比正方体的体积小一些
D.
圆柱的体积比正方体的体积大一些
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