【多选题】根据大量实践证明,判断多元酸能否滴定的原则是( )。
B.
当相邻的两个 值,相差 时,在前一个化学计量点时将出现一个滴定突跃
C.
如相邻的Ka值相差小于 时,滴定时两个滴定突跃将混在一起,无法进行分步滴定
【多选题】根据大量实践证明,判断多元酸能否滴定的原则是( )。
A.
当多元酸各级的CaKa≥10-8,则该级离解的H+可被滴定
B.
当相邻的两个Ka值,相差105时,在前一个化学计量点时将出现一个滴定突跃
C.
如相邻的Ka值相差小于105时,滴定时两个滴定突跃将混在一起,无法进行分步滴定
【单选题】According to the passage, Anderson's theory explains the longevity of British colonial authority in India because the British
A.
offered great flexibility and authority to the local elites with whom they were obliged to negotiate
B.
felt a great temptation to act unilaterally and exercise military authority of their Indian possessions
C.
became more deeply enmeshed in the politics of the Indian subcontinent than was strategically appropriate
D.
managed to convince the local elites that submission to the British would be economically advantageous for all parties
E.
resisted successfully the attempts of local power brokers to revise the terms of their negotiations
【单选题】引起人类移植排斥反应的 HLA 分子属于
【单选题】语言的发展有一个重要规律,语言是在一定的社会环境中( )获得的。
【单选题】According to the author, it is hard for a society to work without
A.
a recognized authority.
【多选题】抹灰工程的砂浆品种。抹灰工程采用的砂浆品种,应符合设计要求,如果设计无具体要求,可遵循下列规定:
A.
外墙门窗洞口的外侧壁、屋檐、勒脚、压檐墙等应用水泥砂浆或水泥混合砂浆 。
B.
湿度较大的房间和车间应用水泥砂浆或水泥混合砂浆
C.
混凝土板和墙的底层应用水泥混合砂浆、水泥砂浆或聚合物水泥砂浆。
D.
硅酸盐砌块、加气混凝土块和板的底层可用水泥混合砂浆或聚合物水泥砂浆。