Volhard法测定下列离子时，发生沉淀转化而引起滴定误差的是()

单项选择题在含有Ca2+和Mg2+离子的溶液中，用EDTA法测定Ca2+，应先消去Mg2+的干扰，宜采用()

单项选择题The jungle welcomes new guests- the hunter Clayton, and the professor and his daughter ().A、SaborB、SarahC、KerchekD、Jane

单项选择题The house ______in bad repair since he moved out.A、wasB、has beenC、had beenD、was being

单项选择题Tarzan has exposed to the ()world by Jane.A、animalB、humanC、jungleD、outer space

单项选择题To John Smith, Indians have()names to various things.A、unusualB、greatC、amazingD、scary

单项选择题It was difficult for the police to ________ the angry crowd.A、hesitateB、pacifyC、satisfyD、spectacle

单项选择题The criminal was released in () of his good behavior.A、caseB、wayC、viewD、event

单项选择题It () on Helen Keller that everything had a name.A、occurredB、downedC、dawnedD、hit

单项选择题On this issue, different () produce different conclusions.A、ideasB、eyesC、pointsD、perspectives

单项选择题Jim Binns wrote me about some of his __________.A、skepticismB、misgivingC、misgivingsD、contemporaries