地表水环境质量标准的微生物学指标是
A．细菌总数B．总大肠菌群数C．甲型肝炎病毒D．隐孢子虫E．粪大肠菌群
参考答案：E
汉译英：“品质证书、重量证书、检疫证书”。( )
A．Certificate of Quantity; Certificate of, Origin; Certificate of Quarantine
B．Certificate of Quality; Certificate of Weight; Certificate of Quarantine
C．Certificate of Quantity; Certificate of Weight; Certificate of Quarantine
D．Certificate of Quarantine; Certificate of Weight; Certificate of Inspection
纯碱生产中的水不溶物，主要来自于（）。
A、盐水中的镁、钙盐
B、石灰石中的镁、钙盐
C、液氨中的杂质
D、三段气中的杂质
