【单选题】English is one of____ spoken in the world. A. the important languages B. the most important languages C. most important language D. the most important language
A.
the important languages
B.
the most important languages
C.
most important language
D.
the most important language
【单选题】Chicago Poems and The People, Yes are the most important collections of poems by ______, the leading character of the Chicago School.
【单选题】UPC is the most important invent in last centruy.
【单选题】用0.1 mol•L-1 HCl溶液滴定0.1 mol•L-1氨水溶液,化学计量点时溶液的pH值为
【单选题】25℃时,取浓度均为0.1 mol/L的醋酸溶液和氨水溶液各20 mL,分别用0.1 mol/LNaOH溶液、0.1 mol/L盐酸进行中和滴定,滴定过程中pH随滴加溶液的体积变化关系如图所示。下列说法正确的是( )
A.
曲线Ⅰ:滴加溶液到10 mL时:c(CH 3 COO - )>c(Na + )>c(H + )>c(OH - )
B.
曲线Ⅰ:滴加溶液到20 mL时: c(Cl - )>c(NH 4 + )>c(OH - )>c(H + )
C.
曲线Ⅱ:滴加溶液在10 mL~20 mL之间存在:c(NH 4 + )=c(Cl - )>c(OH - )=c(H + )
D.
曲线Ⅱ:滴加溶液到10 mL时:c(CH 3 COO - )-c(CH 3 COOH)=2[c(H + )-c(OH - )]
【单选题】用0.1 mol/L HCl溶液滴定c(NH3)=0.1 mol/L氨水溶液化学计量点时溶液的pH值为 ( )
【单选题】用c(HCI)=0.1mol/LHCI溶液滴定c(NH3)=0.1mol/L氨水溶液化学计量点时溶液的PH为( )
【单选题】根据《素问·痿论》所述,认为是“经脉之海也,主渗灌谿谷”的经脉是:
【单选题】UPC is the most important invent in last centruy.
【单选题】Money is very important, ______ it isn't the most important thing. [ ]