大牛和小牛的头数比是4：5，表示大牛比小牛少______．
1-45=15；
答：表示大牛比小牛少15．
故答案为：15．
用所给动词的适当形式填空。
1. Thank you for _____ ( give ) me the picture of Li Yuchun.
2. My twin brother often _____ ( dress ) up as a cool boy.
3. May Day _____ ( come ). What are you going to do?
4. I'd like _____ ( drink ) some black tea.
5. He and I _____ ( not be ) busy now.
在参数的实时趋势图上，查不到测点的（）
A、量程范围
B、报警上下限
C、测点描述
D、报警产生的时间
