单项选择题 预算定额和费用标准都是重要的计价基础资料。两者的关系可以描述为()

单项选择题 If Henry had not pull his cap low over his brow, he () by the police.

单项选择题 2000年我国研制的神威号计算机的浮点运算速度达到每秒()亿次。