【单选题】用标准NaOH溶液滴定未知浓度的盐酸溶液,下列操作会使测定结果偏低的是
A.
配制NaOH标准液时,所用的NaOH固体中含有少量的KOH杂质
C.
滴定前,碱式滴定管尖嘴部分有气泡,滴定后气泡消失
D.
碱式滴定管用蒸馏水洗净后,直接装入标准NaOH溶液
【简答题】A.diversion B.diversity C.disease D.specialization
【多选题】在2008年国际金融危机的影响下,西方国家出现了各种问题,主要有( )
【单选题】用标准的NaOH溶液滴定未知浓度的盐酸,若测定结果偏低,其原因可能是( )
B.
滴定终点读数时,仰视滴定管的刻度,其他操作正确
C.
盛装未知液的锥形瓶用蒸馏水洗过后再用未知液润洗
D.
滴定前无气泡,滴定到终点时,发现尖嘴处有气泡
【单选题】Specialization and trade:
A.
improves standards of living.
B.
is based on who can produce a good at the lower opportunity cost.
C.
is based on comparative advantage.
D.
is accurately described by each of the preceding statements.
【单选题】Which statement accurately defines work specialization?
A.
It is the degree to which tasks are grouped together.
B.
Individual employees specialize in doing part of an activity rather than the entire activity.
C.
Jobs are ranked relative only to their worth or value to the businesses.
D.
Work specialization clarifies who reports to whom.
【多选题】2008年在国际金融危机影响下西方国家社会生活中出现的问题有()
【简答题】2008年在国际金融危机影响下西方国家社会生活中出现的问题有()
【单选题】用标准浓度NaOH溶液滴定未知浓度的盐酸溶液,若用酚酞作指示剂,滴定终点的颜色变化是
【单选题】用标准的NaOH溶液滴定未知浓度的盐酸,若测定结果偏低,其原因可能是( )
B.
滴定终点读数时,俯视滴定管的刻度,其他操作正确
C.
盛装未知液的锥形瓶用蒸馏水洗过后再用未知液润洗
D.
滴定到终点读数时,发现滴定管尖嘴处悬挂一滴溶液