ZJ type Roots vacuum pump can't discharge gases directly into the air,it should be equipped with a cowesponding prepump at operation.
ZJ型罗茨真空泵不能直排大气，运行时需配备相应前级泵。
原声例句
Special English慢速英语
The Shanghai ZJ Bio-Tech Company is a high-tech enterprise which focuses on developing, manufacturing and selling gene diagnostic reagents.
上海之江生物科技股份有限公司是一家一家专业从事基因诊断试剂开发、生产及销售的国家高新技术企业。
中级英语短文
The test kit developed by ZJ Biotech can accurately identify monkeypox virus by measuring the gene segment of the virus by specific fluorescence method.