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【简答题】
例1 真空中有三个同种点电荷,它们固定在一条直线上,如图所示.它们的电荷量Q均为4.0×10-12C,求 所受静电力的大小和方向.
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举一反三
【单选题】Instead of saying 'The lion beat the unicorn all round the town.' they say 'All around the town the lion beat the unicorn. ' The change in linear order changes our perspective about the concerns of th...
A.
metalingual
B.
bilingual
C.
multilingual
D.
trilingual
【单选题】Instead of saying 'The lion beat the unicorn all round the town.' they say 'All around the town the lion beat the unicorn.' The change in linear order changes our perspective about the concerns of the...
A.
metalingual
B.
bilingual
C.
multilingual
D.
trilingual
【简答题】Despite the fact that it has never been seen almost everyone is familiar with the legendary unicorn(独角兽). Descriptions of unicorns have been found dating from ancient times. The great philosopher Aris...
【简答题】海运单
【简答题】受中医古籍《肘后备急方》中将青蒿“绞汁”用药的启发,屠呦呦采用低温提取的方法,从黄花蒿中直接提取得到青蒿素。青蒿素易溶于有机溶剂,不溶于水,不易挥发,对热不稳定。回答下列问题: (1) 青蒿素的提取________(填“适宜”或“不宜”)采用水蒸气蒸馏法,原因是_______________________________________________。 (2) 屠呦呦采用乙醚浸提法提取青蒿素,...
【单选题】Ghost, dragon and unicorn do not exist in the world, and Confucius is not present at this moment, but we can still use language to refer to them. This reflects that language has the feature of_____。
A.
arbitranness
B.
duality
C.
creativity
D.
displacement
【简答题】平行板电容器的公式中S表示_______________
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