【单选题】The young man didn't know ________ to get married or to wait.
【单选题】用含有少量Ca2+的蒸馏水配制EDTA溶液,于PH=5.0时,用锌标准溶液标定EDTA溶液的浓度,然后用上述EDTA溶液,于PH=10.0时,滴定试样中Ca2+的含量,对测定结果的影响是()。
【单选题】The young man didn't know _____ to get married or to wait.
【单选题】The young man didn't mean to the house. He stole into it and made a fire only to get warm.
【单选题】用含有少量Ca2+的蒸馏水配制EDTA溶液,于pH=5.0时,用锌标准溶液标定EDTA溶液的浓度,然后用上述EDTA溶液,与pH=10.0时,滴定试样中Ni2+的含量,对测定结果的影响是()