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【单选题】
标定NaOH滴定液最佳选用的基准物质是A.
无水碳酸钠
B.
邻苯二甲酸氢钾
C.
硼砂
D.
草酸钠
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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】知识点:单摆的周期与摆长关系 9. 一单摆的周期恰好为 1s,它的摆长为 ( ) A. 0.99m B. 0.25m C. 0.78m D. 0.5m
A.
B.
C.
D.
D
【简答题】We spent a day in the country and picked a lot of flowers. Our car was of flowers inside! the way home we had to stop at traffic lights, and there my wife saw the bookshelf. It stood outside a furnitu...
【单选题】隐蔽抗原准确含义是指
A.
不同于正常人体组织的成分
B.
是相对独立的组织成分
C.
从胚胎期到成人因有免疫屏障与免疫系统隔离的自身组织成分
D.
因理化因素的作用而发生改变的自身组织成分
E.
.因病原体感染而发生改变的自身组织成分
【单选题】For him to be re-elected, what is essential is not that his policy works, but that the public believe that it ______.
A.
is
B.
does
C.
has done
D.
is done
【判断题】The overlaps of tax jurisdiction of two or more countries lead directly to the international double taxation.
A.
正确
B.
错误
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