在含有Ag+、Ag(NH3)+和Ag(NH3)2+的溶液中,用银离子选择性电极采用直接电位法测得的活度是( )。
A.Ag+
B.Ag(NH3)+
C.Ag(NH3)2+
D.Ag++Ag(NH3)++Ag(NH3)2+
A.Ag+
B.Ag(NH3)+
C.Ag(NH3)2+
D.Ag++Ag(NH3)++Ag(NH3)2+
0.29molNH3溶解在0.45L0.36mol·L-1的AgNO3溶液中,已知:
NH3K(NH4·H4O)=1.8X10-5,K[Ag(NH3)2]+=1.1X107,计算平衡时各种物质的浓度.
Don't be afraid to ______ him if you are in trouble.
A.turn in
B.turn down
C.turn to
D.turn against
The main idea of the passage is given in the sentence beginning with "______"
A.Not long ago a California policeman stopped…
B.Thousands of babies are given strange names…
C.There's a Katz Neow in Washington D.C.…
D.But perhaps the strangest name of all is…
Who benefited the most from the competition among travel agencies?
A.Consumers.
B.On-line agencies.
C.Airliners.
D.Traditional agencies.
以下银量法测定需采用返滴定方式的是()。
A.莫尔法测C1-
B.吸附指示剂法测C1-
C.佛尔哈德法测C1-
D.AgNO3滴定C1-(生成Ag(CN)2-2指示终点)
体三极管的|VA|均为100V,|VBE(on)|=0.7V,并设T23的输入电阻为9.1MΩ,IC17=550μA,|VCC|=|VEE|=15V,试求T16、T17组成的中间增益级的输入电阻R1和电压增益Av。
(2)利用上题提供的管子参数,试求F007集成运放内部电路中输入差分级电路的输入电阻Rid和互导增益Ag。设各管rce忽略不计。已知差分放大器的偏置电流为20μA。
从右边方格内找出与左边英语短语相匹配的翻译选项
(A)jury trial ( )预审
(B)mediation agreement ( )停止诉讼程序
(C)preliminary hearing ( )从犯
(D)default judgment ( )法律实体
(E)stay court proceedings ( )无效合同
(F)substantially certain ( )陪审团审判
(G)legal entity ( )证据不足
(H)accessorial criminal ( )缺席判决
(I)not proven ( )调解书
(J)void contract ( )大致确定