皮皮学，免费搜题
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【单选题】
分子遗传学发展了以( )为中心的基因操作技术,为通过基因修饰改造蛋白质提供了工具
A.
PCR技术
B.
定点诱变
C.
分子克隆
D.
盒式突变
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】Dreams Dreams do not happen when you're asleep. They happen when you're awake. Whatever your goals are, always remember you can make it true. Whether it be love, money, a childhood dream, and ultima...
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【单选题】某企业(增值税一般纳税人) 2018 年 10 月承接一项设备安装劳务,劳务合同总收人为 200 万元 ( 不含增值税 ) ,预计合同总成本为 140 万元,合同价款在签订合同时已收取,采用完工百分比法确认劳务收人。 2018 年已确认劳务收人 80 万元,截至 2019 年 12 月 31 日,该劳务的累计完工进度为 60%) 。 2019 年该企业应确认的劳务收人为 ( ) 万元
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