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【单选题】
首创“事文合编”体例的类书是( )A.
永乐大典
B.
北堂书钞
C.
艺文类聚
D.
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【单选题】We all wonder what ( ) him to live in that remote village for 8 years.
A.
inducted
B.
conducted
C.
induced
D.
indicted
【单选题】Aunt Dotty loves adventure. On her 60th birthday, she went mountain climbing in the Alps. On her 70th birthday, she went on a trip to the North Pole. When she was 80, she drove solo across the United ...
A.
On her 60th birthday, she went mountain climbing in the Alps.
B.
On her 70th birthday, she went on a trip to the North Pole.
C.
When she was 80, she drove solo across the United States.
D.
She loves to eat chocolate.
E.
We all wonder what she will do when she is 90.
【简答题】某化学学习小组为比较镁和铝的金属活动性强弱设计了如下实验方案。 实验准备： (1) 用98 ％的浓硫酸配制10 ％的硫酸溶液。现有烧杯、玻璃棒、胶头滴管， 还需要的仪器有 _________ ；在稀释时，一定要 ，并不断搅拌。 (2)准备两块表面积相同的镁条和铝条，并除去表面的氧化膜。要求两种金属片表面积相同的原因是 。 【方案一】将除去氧化膜的镁条、铝条，分别与相同体积相同质量分数的硫酸反应，...
【简答题】什么是临界热绝缘直径?平壁外和圆管外敷设保温材料是否一定能起到保温的作用,为什么?
【单选题】48 衰变常数λ反映了放射性物质的固有属性 ( )λ值越大,说明该物质越不稳定,衰变的越快
A.
λ值越大，说明该物质越不稳定，衰变得越慢
B.
λ值越大，说明该物质越不稳定，衰变得越快
C.
λ值越大，说明该物质越稳定，衰变得越慢
D.
λ值越大，说明该物质越稳定，衰变得越快
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