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【多选题】
下列操作哪些可能会引起滴定结果偏高的是()
A.
滴定前试液 A 中还有部分 Fe 2+ 离子未被氧化成 Fe 3+ 离子
B.
EDTA 与 Fe 3+ 滴定过程中温度控制低于 60 o C
C.
在用 EDTA 滴定 Ca 2 +时 未加掩蔽剂三乙醇胺
D.
EDTA 滴定 Ca 2 + 时，为了去除溶液中的 SiO 3 2- 加入了过量的 KF 溶液
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参考答案：
举一反三
【单选题】雾霾危害虽多,但是我们可以采取相应的措施来应对雾霾天气,下列哪项措施不值得提倡( )
A.
绿色出行，少开私家车。
B.
劝导家人少燃放烟花爆竹减少污染。
C.
多吃清肺润肺食品。
D.
应加大在雾霾天气开窗通风的频率
查看完整题目与答案
【单选题】在竞赛时或竞赛前后即刻存在的主观上所认知到某种危险或威胁情境的担忧属于________。
A.
躯体状态焦虑
B.
认知状态焦虑
C.
状态自信心
D.
激活状态焦虑
查看完整题目与答案
【单选题】听力原文：W: You must have enjoyed using your new camera on your trip. M: I would have, but after buying a new camera especially for that trip, I left it in the car with my friend who drove me to the airpo...
A.
He enjoyed using his new camera.
B.
He left his camera at the airport.
C.
He left his camera in his friend's car.
D.
He lost his camera on his trip.
查看完整题目与答案
【判断题】民间有“加吉鱼尾,鲅鱼头”之说
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：W: You must have enjoyed using your new camera on your trip. M: I would have, but after buying a new camera especially for that trip, I left it in the car with my friend who drove me to the airpo...
A.
The man lost his new camera at the airport.
B.
The man left his new camera in his friend's car.
C.
The man enjoyed using his new camera on his trip.
D.
The woman lost her new camera on her way to the airport.
查看完整题目与答案
【单选题】在下列 Java 的基本数据类型中,所占字节数最少的是 ________ 。
A.
char
B.
boolean
C.
short
D.
float
查看完整题目与答案
【单选题】鲐鱼中含量较高,特别是在不新鲜时含量更高并能引起食用者发生过敏中毒现象的物质是
A.
组胺酸
B.
三甲胺
C.
氧化三甲胺
D.
组织胺
查看完整题目与答案
【单选题】在下列Java的基本数据类型中,所占字节数最少的是( )
A.
a. boolean
B.
b. float
C.
c. char
D.
d. short
查看完整题目与答案
【判断题】雾霾天气应尽量不要开窗，确实需要开窗透气的话，应尽量避开雾霾高峰时段，可以将窗户打开一条缝短时间通风.（）
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：W: You must have enjoyed using your new camera on your trip. M: I would have, but after buying the new camera especially for that trip, I left it in the car with my friend who drove me to the air...
A.
He left his camera at the airport.
B.
He enjoyed using his new camera.
C.
He lost his new camera on his trip.
D.
He left his camera in his friend's car.
查看完整题目与答案
相关题目：
【单选题】雾霾危害虽多,但是我们可以采取相应的措施来应对雾霾天气,下列哪项措施不值得提倡( )
A.
绿色出行，少开私家车。
B.
劝导家人少燃放烟花爆竹减少污染。
C.
多吃清肺润肺食品。
D.
应加大在雾霾天气开窗通风的频率
查看完整题目与答案
【单选题】在竞赛时或竞赛前后即刻存在的主观上所认知到某种危险或威胁情境的担忧属于________。
A.
躯体状态焦虑
B.
认知状态焦虑
C.
状态自信心
D.
激活状态焦虑
查看完整题目与答案
【单选题】听力原文：W: You must have enjoyed using your new camera on your trip. M: I would have, but after buying a new camera especially for that trip, I left it in the car with my friend who drove me to the airpo...
A.
He enjoyed using his new camera.
B.
He left his camera at the airport.
C.
He left his camera in his friend's car.
D.
He lost his camera on his trip.
查看完整题目与答案
【判断题】民间有“加吉鱼尾,鲅鱼头”之说
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：W: You must have enjoyed using your new camera on your trip. M: I would have, but after buying a new camera especially for that trip, I left it in the car with my friend who drove me to the airpo...
A.
The man lost his new camera at the airport.
B.
The man left his new camera in his friend's car.
C.
The man enjoyed using his new camera on his trip.
D.
The woman lost her new camera on her way to the airport.
查看完整题目与答案
【单选题】在下列 Java 的基本数据类型中,所占字节数最少的是 ________ 。
A.
char
B.
boolean
C.
short
D.
float
查看完整题目与答案
【单选题】鲐鱼中含量较高,特别是在不新鲜时含量更高并能引起食用者发生过敏中毒现象的物质是
A.
组胺酸
B.
三甲胺
C.
氧化三甲胺
D.
组织胺
查看完整题目与答案
【单选题】在下列Java的基本数据类型中,所占字节数最少的是( )
A.
a. boolean
B.
b. float
C.
c. char
D.
d. short
查看完整题目与答案
【判断题】雾霾天气应尽量不要开窗，确实需要开窗透气的话，应尽量避开雾霾高峰时段，可以将窗户打开一条缝短时间通风.（）
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：W: You must have enjoyed using your new camera on your trip. M: I would have, but after buying the new camera especially for that trip, I left it in the car with my friend who drove me to the air...
A.
He left his camera at the airport.
B.
He enjoyed using his new camera.
C.
He lost his new camera on his trip.
D.
He left his camera in his friend's car.
查看完整题目与答案
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