题干
These penguins are ________interesting.
A：this kind of
B：kind of
C：kinds of
D：kind
答案(点此获取答案解析）
B
These penguins are ________interesting.
A：this kind of
B：kind of
C：kinds of
D：kind
。该温度下,将pH=4的
溶液与pH=9的NaOH溶液混合并保持恒温,欲使混合溶液的pH=7,则稀硫酸与NaOH溶液的体积比为( )