按四舍五入对π取近似值精确到十分位约为______．
π≈3.1415926…，对其精确到十分位，只需对百分位的数字进行四舍五入，即3.1．
下列（）可不设消防给水系统。
A、加油站
B、液化石油气加气站
C、压缩天然气加气站
D、加油和液化石油气加气合建站
E、加油和压缩天然气加气合建站
Suppose your mother has come to see you and tonight you will sleep in the room she has booked in a hotel near your university. Write a note in about 100 words to inform your roommate Linda of that. Do not sign your own name at the end of your letter, using "Rachel" instead.
