【判断题】放大电路只要能放大信号功率就可以称其有放大作用。
【简答题】用能斯特方程计算电对H 3 AsO 4 /H 3 AsO 3 在PH=0,2,4,6,8,9时的电极电势。用计算的结果绘制pH - 电势图,并用该图判断反应H 3 AsO 4 +2I - +2H + ⇋H 3 AsO 3 +I 2 +H 2 O在不同酸度下的反应方向。
【简答题】已知 φ Θ (H 3 AsO 4 /H 3 AsO 3 ) = 0.559 V , φ Θ (I 2 / I - ) = 0.535 V 。试计算反应 H 3 AsO 3 + I 2 + H 2 O = H 3 AsO 4 + 2I - + 2H + 在 298 K 时的平衡常数。
【单选题】听力原文:Ken :Hello, Rob. Rob :Hello, Ken... Hello Barbara. Come in. Shall I take your coats? Ken :Thank you very much. What a lovely house! Rob :I'm glad you like it. Ken :Where' s Anna? Rob :Oh, she's i...
A.
Ken and Barbara are eating out tonight.
B.
Rob and Anna are entertaining their friends at home.
C.
Anna is cooking a big meal for a family party.
D.
Old friends are gathering in Rob' s home to celebrate his birthday.
【判断题】反应 H 3 AsO 4 +2H + +2I - = H 3 AsO 3 +I 2 +H 2 O 进行的方向与溶液的酸度有关
【判断题】3 Rob would take a pen and paper to write a book.
【多选题】给水管道系统按其服务对象的不同可分为( )系统。
【判断题】放大电路只要能放大信号功率就可以称其为其有放大作用( )
【单选题】The train arrives in Liverpool at 10 p.m. tonight . The plane I would like to take from there _______ by then.
【单选题】According to the passage, how many couples broke up within a year?