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斯特定律:即()只有分量,若自然光入射,则反射波为完全线偏振波。
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【简答题】某同学设计了以下操作流程来除去混在氯化钠固体中的少量硫酸钠和氯化钙。 （1）试剂A是__________，试剂A需要过量的原因是___________。 （2）操作a得到的滤渣的成分是_____________，在实验室中进行操作a需要的仪器是：铁架台（带铁圈）、滤纸、烧杯、___________、____________。 （3）加入试剂C调节滤液pH的离子反应方程式是_____________...
【简答题】为了研究氢氧化钡溶液与稀硫酸反应变化情况，某学校兴趣小组分成三组，分别设计了如下实验： Ⅰ组．导电性实验 ①将两根铜丝接触，插上电源，灯泡变亮； ②将两根铜丝分别插入（不接触）盛有水的烧杯中（如下左图），插上电源，灯泡没有变亮； ③在实验②的基础上往烧杯中滴加一定量氢氧化钡溶液，灯泡变亮； ④在实验③的基础上往烧杯中滴加稀硫酸溶液至过量。 （1）实验①灯泡变亮的原因是铜导线中含有 ； （2）通过实...
【单选题】Which of the following statements is true about the cocktail party?
A.
Cocktail refers to an alcoholic drink consisting of a spirit or spirits mixed with other ingredients, such as fruit Juice or cream.
B.
The cocktail party is usually held early in the morning.
C.
The cocktail party is a very formal social gathering.
D.
No food is served at a cocktail party.
【简答题】用图1-3所示装置（酒精灯、铁架台等未画出）制取三氯化磷。在具支烧瓶d中放入足量白磷，将氯气迅速而又不间断地通入具支烧瓶中，氯气与白磷就会发生反应，产生火焰。三氯化磷和五氯化磷的物理常数见下表。 熔点/℃ 沸点/℃ 三氯化磷 -122 76 五氯化磷 148 200 ℃分解 图1-3 （1）有浓盐酸、浓硫酸、白磷、二氧化锰、氢氧化钠等物质供选用，a、b中应该装入的试剂分别是：a________，b...
【单选题】Which of the following statements is true about the cocktail party?
A.
No food is served at a cocktail party.
B.
Cocktail refers to an alcoholic drink consisting of a spirit or spirits mixed with other ingredients, such as fruit juice or cream.
C.
The cocktail party is usually held early in the morning.
D.
The cocktail party is a very formal social gathering.
【单选题】Which of the following statements is true about the cocktail party?
A.
Cocktail refers to an alcoholic drink consisting of a spirit or spirits mixed with other ingredients, such as fruit juice or cream.
B.
The cocktail party is usually held early in the morning.
C.
The cocktail party is a very formal social gathering.
D.
No food is served at a cocktail party.
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