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【单选题】
HTTP的默认端口号是（）A.
25
B.
80
C.
8000
D.
8080
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举一反三
【简答题】如图1，抛物线y=a（x-2） 2 -2的顶点为C，抛物线与x轴交于A，B两点（其中A点在B点的左边），CH⊥AB于H，且tan∠ACH= 1 2 （1）求抛物线的解析式； （2）在坐标平面内是否存在一点D，使得以O、B、C、D为顶点的四边形是等腰梯形？若存在，求所有的符合条件的D点的坐标；若不存在，请说明理由； （3）如图2，将（1）中的抛物线平移，使其顶点在y轴的正半轴上，在y轴上是否存在一点...
【单选题】According to the experts, the reversal of the Earth's magnetic field would ______.
A.
destroy almost all the creatures on the Earth
B.
cause some species extinctions on the Earth
C.
not be as disastrous as the previous one
D.
cause no big trouble for man and animals
【多选题】下列叙述错误的是( )
A.
颈外侧浅淋巴结的输出管汇成颈干
B.
胸壁的淋巴管汇成胸导管
C.
右侧腰干注入右淋巴导管
D.
小肠的淋巴经肠干注入乳糜池
E.
右淋巴导管注入右静脉角
【简答题】A．A rapid rise in population. B．A shortage of fuel. C．Destroy of the wilderness. D．Destroy of the natural resources.
【单选题】With the bridge______, there was nothing for the river but to swim.
A.
was destroyed
B.
destroying
C.
being destroyed
D.
destroyed
【简答题】脊柱损伤现场急救措施不正确的是
【单选题】By comparison, the author considers that ______.
A.
a more advanced civilization will destroy us if they visit us at present
B.
the original inhabitants of America were better off because of Columbus' visit
C.
being visited by a more advanced civilization will do us good
D.
we wouldn' t be better off even though we were visited by the beings from outer space at present
【简答题】Scientists in California and Virginia will try to decode genetic makeup of two plant-destroying microbes, including 【M1】______ one blaming for killing tens of thousands of oak trees along the 【M2】____...
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