一个完全平方式为a2+■+9b2，但有一项不慎被污染了，这一项应是 ______
题型：填空题
问题：
一个完全平方式为a2+■+9b2，但有一项不慎被污染了，这一项应是 _________ ．
题型：填空题
| 阅读理解。 | ||||
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www.allweatherwindows.com | ||||
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[ ] | ||||
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| 2. The two ads are most probably about _____. | ||||
[ ] | ||||
| A. managing money matters B. environmental protection C. architecture styles D. home improvement & design | ||||
| 3. If you prefer comfort as well as energy efficiency,you can______. | ||||
[ ] | ||||
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