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【单选题】
25°C时,在含CH 3 COOH和CH 3 COO ˉ的溶液中, CH 3 COOH和CH 3 COO ˉ二者中各自所占的物质的量分数 (α)随溶液pH变化的关系如图所示。下列说法 不正确 的是A.
K ( CH 3 COOH )=
B.
在 pH＝7的溶液中，α ( CH 3 COOH ) ＝ 0，α (CH 3 COO ˉ ) ＝ 1.0
C.
在 pH＞4.76的溶液中， c (CH 3 COO ˉ ) 与 c (OH ˉ )之和可大于 c (H + )
D.
在 pH＝4.76的溶液中加盐酸，α ( CH 3 COOH ) 与 α (CH 3 COO ˉ ) 之和保持不变
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【单选题】Guangdong food is (有一点)Shandong food is salty and fresh , Sichuan food is famous for its hot and spicy.
A.
little
B.
a bit light
C.
a bit
D.
bit
【简答题】Guangdong food is a bit light, Shandong food is salty and fresh , Sichuan food is famous for its hot and spicy.
【单选题】ResultSet接口中,能够直接将指针移动到第n条记录的方法是( )
A.
absolute方法
B.
previous方法
C.
moveToCurrentRow方法
D.
getString方法
【单选题】The Greens used to eat western food, but now they ______ Chinese food in Shandong.
A.
used to eat
B.
are used to eat
C.
are used to eating
D.
are used for eating
【简答题】Bad food is a source of illness. A) resource B)origin C) reason D)step
【简答题】教学媒体的选择依据有哪些?应遵循哪些原则?
【简答题】Chinese food is divided into 8 kinds of cuisines, such as Cantonese food, Shandong food, Sichuan food , etc.
【单选题】Chinese food is (分成)8 kinds of cuisines, such as Cantonese food, Shandong food, Sichuan food , etc.
A.
divided into
B.
divided
C.
divide
D.
divided to
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