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发布日期:2020-12-11
是指生物发育过程的阶段划分,特别是指形态、生理、生态等质的差异。一般是以性成熟为界线,种性维持的机能大致可分为潜在的阶段和显露的阶段。
分为 - 拼音fēn wéi 动词,生活中经常使用词语,如:“一分为二”、“一分为三”等。
哺乳动物的卵巢中,卵母细胞发生与发育的基本功能单位为卵泡,呈圆形泡状,位于卵巢皮质。与雄性动物睾丸终生含有生殖干细胞不同,雌性哺乳动物的卵泡储备是有限并在成年期不可更新的。
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Practice 12 ● Read this part of a letter from Judy Matthews applying for a job. With reference to your advertisement in The Financial Times, I am writing to apply for the post of chief accountant. I am moving to your country next month with my husband. As you will see from the enclosed CV, I have had a lot of experience in management accounting and I feel that I can be an asset to your company. If I am selected for interview, please could you give me information about how to reach your offices by public transport? ● Write a letter to Mrs. Matthews: ● acknowledging her letter, ● offering her a date and time for an interview, ● requesting the names and addresses of two referees, ● telling her the best way to reach you by public transport. ● Write 60-80 words. ● Write on your Answer Sheet. Do not include any postal addresses. Dear Mrs. Matthews,
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