对于管道剩余壁厚的抽查测定，每个管件测厚位置不得少于（）处。
参考答案：3
After reading
of his biology homework on Monday night, Bernie read
of his remaining homework on Tuesday night. What fraction of his original homework would Bernie have to read on Wednesday night to complete his biology assignment
瓶装易燃气体危险特性警示标志底色是（）色。
A.黄
B.红
C.绿
D.白
of his biology homework on Monday night, Bernie read 
of his remaining homework on Tuesday night. What fraction of his original homework would Bernie have to read on Wednesday night to complete his biology assignment