吸气或呼气结束的一瞬间肺内气压与大气压的关系是( )
A:肺内压等于0
B:二者相等
C:肺内压大于大气压
D:肺内压小于大气压
下列关于金属的说法正确的是( )
I have the ____of reading before sleeping. It has been part of my life.
维生素C(Vitamin,Ascorbic Acid)又叫L﹣抗坏血酸,酸性,是一种水溶性维生素,在空气中及高温下易被氧化.碘单质能将其氧化.其结构如图.
My dictionary doesn’t have many words. I need a ______ dictionary.
Many disabled children are ______ need of help. We should try our best to help them.