∵a>0,
∴a+1a≥2a•1a=2(当且仅当a=1时取“=”).
故答案为:2
根据短文内容和所给的中文提示,写出空白处各单词的正确形式,每空限填一词。
I am a middle school student and I'm 小题1: (十五)years old, I’m quite healthy. 小题2: (然而), one year ago I was fat. I loved chips and chocolate, and I got tired 小题3: (容易地). One morning, I saw some young men running in the park. They looked really fit and ___小题4:____(积极的) . So I started running from 小题5: (那时)on .
Now I have a 1.5-mile run every morning, I 小题6: ( 喝 ) milk and eat fruit and vegetables____小题7:______(代替) of chips and chocolate. These good eating habits and running help to build me up. I have great fun running. I feel well and look fit. Running has 小题8: (成为) my favorite sport, I'm 小题9: (确信)I will do well in the boys' 800-metre race in our school sports meet.
If you want to be healthy, 小题10: (加入)us !
工程监理单位超越本单位资质等级承揽工程的,责令停止违法行为,处合同约定监理酬金()的罚款。
A、1倍以上2倍以下
B、1.5倍以上2倍以下
C、2倍以上2.5倍以下
D、2倍以上3倍以下