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- In this paper,three kinds of catalysts are introduced and discussed according to the acid or base active site.The prospect of the catalysts for aldol condensation is also been put forward. 本文根据活性中心的不同,对酸性、碱性和酸-碱两性三类不同的催化剂进行了论述,分析了羟醛缩合反应催化剂今后的发展方向。
- It is a good idea to have an enjoyable, fun and group based activity at the end of a class, where the students can interact with each other and use the language learnt during the lesson. 结束一课的讲解并不需要多么漂亮的收尾，但是，如果能在课堂后段安排一个有趣的集体活动，使学生们使用课文中学到的语言互动起来，那么这也是一个不错的主意。
- In this paper, three kinds of catalysts are introduced and discussed according to the acid or base active site.The prospect of the catalysts for aldol condensation is also been put forward. 本文根据活性中心的不同，对酸性、碱性和酸-碱两性三类不同的催化剂进行了论述，分析了羟醛缩合反应催化剂今后的发展方向。
- The runner was retired put out at first base. 跑垒者于第一垒上被刺杀出局。
- The runner went to second base on a wild pitch. 一记瞎设让跑垒员跑上了第二垒。
- You cannot enter a military base without a permit. 无通行证者不得擅入军事基地。
- Based on the mechanism of base activating bentonite, P zeolite was hydrothermally synthesized by alklia-treament bentonite of Ling Shou , Hebei Province. 根据碱法活化膨润土机理，确定了以河北省灵寿县膨润土为原料，经碱熔活化，水热合成洗涤用P型沸石的新型工艺方法。
- Her heavy industry rests on a broad and firm base. 它的重工业有广泛坚实的基础。
- When I see that Chinese always joined and participated in Chinese based activities, it really irks me. 其实我看见我的同胞参与的活动一二三四五都是华人活动，我是很心痛的。
- A coal based activated carbon with higher adsorptivity is produced in the laboratory by using Yangquan anthracite. 选用阳泉矿区的3种无烟煤为原料,通过调整工艺参数,在实验室研制出具有较高吸附性能的煤质活性炭产品。
- The dye adsorption behavior of a series of sisal based activated carbon fibers(SACF) in water was studied. 研究了一系列剑麻基活性炭纤维（SACF）对模拟染料废水的处理特征。
- He caught me off base with that question. 他的问题猝然把我给问倒了。
- The bombers swooped on the air base. 轰炸机突袭空军基地。
- Many languages have Latin as their base. 许多语言都以拉丁语为基础。
- His base conduct was condemned by everyone. 他的无耻行为受到所有人的谴责。
- In the production process of activated carbon, the trace element of coal affects the quality of coal based activated carbon directly. 在活性炭生产中,原料煤中含有的微量金属元素的多少直接影响到煤基活性炭的品位。
- His idea is completely off base. 他的想法大错特错。
- Two soldiers dismounted the gun from the base. 两个战士把炮从底座上卸下来。
- In the playgroup, students do a variety of topic based activities such as games, arts &crafts, songs / rhymes, story telling, role play, etc. 老师会以不同的活动配合主题，如游戏、手工、讲故事、角色扮演等，吸引幼童学习。
- The preparation of viscose based activated carbon fiber(ACF) felt through carbonization activation processes in vacuum was studied. 介绍了用粘胶纤维毡在真空设备中经碳化活化工艺制备活性碳纤维(ACF)毡的研究工作。
