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普氏立克次体通过人虱传播引起( )。
竣工验收时为鉴定工程质量,对隐蔽工程进行必要的挖掘和修复费用不属于建筑安装工程费。
非营业活动中提供的交通运输业和部分现代服务业服务不属于提供应税服务。非营业活动,是指()。
把基本磁盘转换为动态磁盘时,基本磁盘上现有的分区将()。
在()下拉式列表中可以选择不同的屏幕保护程序。
超离心法纯化质粒DNA时,选用 CsCl 作介质的优点是: (1)()(2)(),从而使不同分子量的DNA分子得以分开。
孕妇于妊娠早期服用具有雌激素作用的药物可致____________。
IgG与补体C1q结合点( )。
当防烟楼梯间前室、合用前室采用敞开的阳台、凹廊进行防烟,该防烟楼梯间可不设置防烟设施。
电力机车为何要设零压保护?其作用是什么?
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