A:1月
B:5月
C:7月
D:11月
图-1
图-2
若a+1a=2,则a2+1a2的值为( )
A
Today is August 3rd. Tomorrow (明天) is Peter's grandfather's birthday. It is his 73rd birthday. Peter's two sisters, Sally and Tina, and Peter buy some things for their grandfather this afternoon. Sally buys a nice birthday card. And she writes(写) “Happy birthday” on it. Tina buys a blue shirt from a clothes store. It is $29. Peter buys some fruits and a set of books. The name of the books is Harry Potter (哈里波特)
根据句意及首字母提示完成句子。
①用火焰灼烧自来水龙头3分钟,然后打开水龙头放水5分钟,再用无菌的三角瓶接取1000毫升水样,盖好瓶塞.
②将漏斗和抽滤瓶固定好,用镊子夹住滤膜边缘,将水样倒入漏斗中,边抽滤、边加水.
③用镊子将滤膜取出、放在无菌平板上进行培养,观察并记录实验结果.
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