A:Because he gets up late.
B:Because it is snowing.
C:Because it is raining.
在下列数字后面填上适当的单位(符号表示):
一桶食用油的体积是5____;
一瓶矿泉水的体积为500____;
一拃的长度约为20____;
物理课本的长度是26____.