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简述Th细胞如何辅助B细胞的免疫应答？
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Once there was a little girl who came to live in an orphanage (孤儿院). As Christmas time was drawing near, all of the other children 11 telling the little girl about the beautiful Christmas tree that would appear in the hall downstairs on Christmas morning. After their usual 12 , each child would be given their only Christmas gift, a small orange. The headmaster of the orphanage was very 13 with the kids. So on Christmas Eve, when he 14 the little girl slipping down the stairs to peek（偷看）at the much-heard-of Christmas tree, he 15 that the little girl would not receive her Christmas orange because she had been so curious as to disobey the rules. The little girl ran back to her room 16 , crying at her terrible fate. The next morning as the other children were going down for breakfast, the little girl stayed in her bed. She couldn’t 17 the thought of seeing the others receive their gift while there would be 18 for her. Later, as the children came back upstairs, the little girl was surprised to be handed a napkin (餐巾). As she carefully opened it, there, to her 19 , was an orange all peeled and sectioned (分瓣). “ How could this be? ” she asked. Then, she realized how each child had taken one section from their orange for her so that she, too , would have a Christmas orange. What an example of the true meaning of Christmas those orphan children showed that morning! How I 20 the world would show the same kind of concern for others, not only at Christmas, but throughout the year! 请在18处填上正确答案（）
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DQL1250/1500.30型斗轮堆取料机的主要用途？
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CPE可以有多种表现，但不应该包括下列哪一种表现（）
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下列描述中，正确的是（）
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下列合同的分类符合一般的分类标准的是（ ）。
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30、我国当前的现代化建设包括经济、政治和文化建设多个方面。
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美国最著名财妇女杂志是（）
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关于宫颈活组织检查，下列描述正确的是（）
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应用一下哪种MRI技术，有助于显示脾脏淋巴瘤和转移瘤（）