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【单选题】
在 0.20mol/LHCl 溶液中,通过加入 ____ ,使 pH 变化至 5.5 所形成的溶液是 pH 缓冲溶液。已知 : HAc , pKa=4.76 ; NH 3 , pK b =4.75 ; (C 5 H 5 N) , p K b =8.74 ; (CH 2 ) 6 N 4 H + , pK a =5.13A.
吡啶 (C 5 H 5 N)
B.
HAc
C.
N H 3
D.
(CH 2 ) 6 N 4 H +
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【单选题】a, lies, cat, chair, the, white, under Put the words in a right order to form a sentence.
A.
The chair under lies a white cat
B.
A cat lie under a white chair.
C.
Under the chair lies a white cat.
D.
Under the white cat lies a chair
【简答题】Saul Bellow's first novel __________________ is an existential study of man’s inability to make his choice in life.
【简答题】夸美纽斯的幼儿教育观点主要有哪些?
【单选题】不正确的赋值或赋初值的方式是 ( )。
A.
．char str[6]＝{‘\0’}；
B.
char str[7] ＝ “string”；
C.
char str[10] ；str＝“string”；
D.
char str[6] ＝“g”
【单选题】a, lies, cat, chair, the, white, under Put the words in a right order to form a sentence.
A.
The chair under lies a white cat
B.
A cat lies under a white chair.
C.
Under the chair lies a white cat.
D.
Under the white cat lies a chair
【单选题】Under no circumstance()to tell lies to the public.
A.
the companies are allowed
B.
are the companies allowed
C.
the companies will allow
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