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【单选题】
机体感染某些传染病后会产生终生免疫,主要是由于有A.
造血干细胞
B.
处女型淋巴细胞
C.
记忆性淋巴细胞
D.
效应性淋巴细胞
E.
造血祖细胞
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皮皮学刷刷变学霸
举一反三
【单选题】[7-29]___indicates that the vertical deflection of a ship’s hull,in longitudinal direction,where the hull midships is bent upwards.
A.
Shearing
B.
Sagging
C.
Hogging
D.
Buckling
【简答题】As the name implies, wastewater is mostly water. A very _______ is waste material.
【单选题】[6-29]The hull is divided up into a number of watertight compartments by ___.甲板和舱壁把船体分割成大量的水密舱室。
A.
inner bottom plating and longitudinals内底板和纵件
B.
decks and bulkheads 甲板和舱壁
C.
double bottom girders 双层底梁
D.
topside and hopper tank sloping plating and longitudinals 顶边和斜边舱板和纵件
【简答题】食品安全性毒理试验的检验程序有四个阶段: 、 、 和 。
【单选题】RE resources, as the name implies, are constantly replenished naturally and will never be exhausted.
A.
refilled
B.
replicated
C.
replaced
D.
replayed
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