从管道出口端采取液体石油化工样品,采样时间间隔和流速成正比,混合体积和流速成反比。
参考答案:错
阅读短文,然后判断句子正(T)误(F)。
I'm Yingying. Today is my birthday. I'm ten years old now. Dad and Mom give me birthday gifts: a doll
and a plane. My friend Yangyang gives me a red balloon. And we eat a big cake at dinner. I like to eat
hamburgers and chicken too.I'm happy. We are all happy.
( ) 1. Today is Yangyang's birthday.
( ) 2. Yingying is 10.
( ) 3. Dad and Mom give Yingying a red balloon.
( ) 4. Yingying likes to eat hot dogs.
( ) 5. They are happy today.
有一压力表,其测量范围0~1000帕,准确度等级为0.5级,求允许其基本误差。