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燃气系统的燃料温度的设计值是小于()℃。
检验申请单上的检验结果不包括以下哪种?()
将学习过程视为“闻一见一知一行”的学者是( )。
COSPAS/SARSAT系统中的EPIRB工作频率是()。
婴幼儿选择性缄默症常见的性格表现为()。
数据稀缺时代下,决策由()决定。
目前我国国家药品标准管理体系的核心是()
原发性高血压的发生是由于()
焊接电源线是焊机与电网的连接导线,电压较高,危险较大,因此其长度一般不得超过()
频率的单位可用赫兹表示,质点振动每秒100000赫兹其频率等于:()
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