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【单选题】
道夫法的原理是利用在盐酸中氯化亚锡将砷盐还原成( )的胶态砷,与一定量的标准砷溶液用同法处理后所得颜色比较。A.
棕色
B.
白色
C.
紫色
D.
红色
E.
黑色
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举一反三
【单选题】_____ more than 100 million references to the word“tuhao” on social media since early September．
A.
It has been
B.
There is
C.
There have been
D.
They are
【单选题】Kale has more nutritional value than spinach. But since collard greens have more nutritional value than lettuce, it follows that kale has more nutritional value than lettuce. Any of the following, if ...
A.
Collard greens have more nutritional value than kale.
B.
Spinach has more nutritional value than lettuce.
C.
Spinach has more nutritional value than collard greens.
D.
Spinach and collard greens have the same nutritional value.
E.
Kale and collard greens have the same nutritional value.
【简答题】天然气的主要成分是[填空(1)]，液化石油气的主要成分是[填空(2)]。
【简答题】Since weeks ago, China has been involved in a worldwide A/H1N1 flu that has already killed more than 80 people in the middle of May, 2009, in Mexico and has turned into a global pandemic． The central ...
【简答题】已知点P的坐标为(m，n)，O为坐标原点，连结OP，将线段OP绕O点顺时针旋转90°得OP′，则点P′的坐标为________．
【简答题】FPA provides a more limited cover than WPA，since it does not include（ ）losses and damages.
【简答题】已知圆的半径为5，圆心为坐标原点O，点A的坐标为（3，4.2），则点A与⊙O的位置关系是______．
【简答题】已知点P的坐标是（3，3），O为原点，将线段OP绕着原点O旋转45°得到线段OQ，则点Q的坐标是 _________ ．
【简答题】（12分)设直线 与圆 交于A、B两点，O为坐标原点，已知A点的坐标为 ．（Ⅰ）当原点O到直线 的距离为 时，求直线 方程；（Ⅱ）当 时，求直线 的方程。
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