维生素A适用的病症是()
A.夜盲症
B.坏血病
C.出血
D.佝偻病
E.脂溢性皮炎
参考答案:A
In drawing up the plan, they went to the library to _____ many books. [ ]
A. bring up
B. referr to
C. look for
D. try on
25℃时,向1 mL pH=1的硫酸中滴加的10 mL pH= b的NaOH溶液,形成的混合溶液成碱性则b可能为 ( )
A.10
B.11
C.12
D.13