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题目：
单选题
A七天无理由退货权
B三天无理由退货权
C三十天无理由退货权
答案：
<查看本题扣1积分>
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世界上最大的树是什么树？答：北美洲的世界爷树。
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急性心肌梗死病人下列哪些预后不良（）
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在销售系统中新增了一张销售方式为赊销的发票，则该凭证应在（）系统生成。
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半自动闭塞区间是否设有轨道电路？
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以下()属于《中华人民共和国刑法》规定的主刑。
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患儿男，3岁，因“咳嗽40d”来诊。体温正常，干咳为主，痰少。予头孢菌素治疗无好转。既往健康，按时进行预防接种。查体：T36.5℃，P90次/min，R26次/min，BP110/70mmHg；呼吸运动对称，语音震颤无增强或减弱、两侧对称、无胸膜摩擦感和皮下捻发感，叩清音，两侧对称，双肺呼吸音粗，左侧略低，未闻及啰音。为进一步明确诊断，首选的措施是（提示PPD试验（－）。呼吸道分泌物真菌培养（－），细菌培养（－），结核培养（－），抗酸染色（－）。追问病史有进食瓜子后呛咳史。）（）
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（）其宗旨是减少或消除食品安全问题。
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读下图，回答下列各题。 下列山地中，成因和图所示不同的是（）
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患儿，女，2岁。急起发病，高热头痛，狂躁不安，颈项强直，口渴，舌质深红，苔黄燥，脉数，诊为急惊风，气营两燔。治疗应首选（ ）
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Chinas young need some form. of sex education. What will they get from it? What is the best way to teach【C1】______? Michael: Im a college student. But I havent【C2】______any sex education from either teachers or parents. In the cyber age, students can get information【C3】______many ways. For teenagers, sex knowledge is important. It will【C4】______their attitudes towards sex. If they get it from pornography(色情文学), their【C5】______towards sex will be unhealthy and they cant deal well with the opposite sex and love. Anna: In recent years, more young【C6】______have had premarital pregnancies(受孕).I think the reason is【C7】______the young are full of curiosity about sex and have no idea about it. Also,【C8】______young girls have been raped, and【C9】______of them have no knowledge about sexual self-protection. So, parents and teachers should【C10】______traditional ideas about sex education for young students to avoid【C11】______harm. Geng Shanshan: In my opinion, Chinese teenagers do need sex education. It is necessary for them to form. a correct view of the opposite sex. It can also【C12】______strengthen young peoples sense of self-protection,【C13】______will control them from doing something【C14】______. Teenagers can get a lot of benefit by receiving such education. Luke: In my opinion, sex education videos could be an effective means to tell young people【C15】______they should know. And, it would be【C16】______easier if boys and girls watched them separately. In addition, communication is necessary : school authorities could【C17】______a hot line to answer students questions about sex. Ding Fei: Sex is the important topic that teachers and parents want to【C18】______. In my opinion, to change this situation, we must first make it【C19】______to teachers and parents that sex education is needed to guarantee(保证)the healthy growth of the young. Obviously, without their participation, sex education will【C20】______be successful.【C1】A．themB．himC．herD．us