求翻译：1. 本厂房生产的原材料为甲醛、苯酚、异丁烯，生产危险性类别为甲类1项，建筑耐火等级为二级。整个车间每班工作人数约20人。是什么意思？

(1) the production of the plant raw material for formaldehyde, phenol, isobutylene, production risk category as Category 1 building fire resistance rating for the two. The entire workshop the number of work shifts of about 20 people.

1.the plant to the raw materials are formaldehyde, phenol, butylenes, production risk category is a class 1 fire-rated building, level 2 is. The entire shop every shift of about 20 people.

1. This workshop production raw material for the formaldehyde, the phenol, the isobutene, the production risky category for the armor class 1 item, the building fireproof rank is two levels.Entire workshop each class of work population approximately 20 people.

1. the workshop production of raw materials for formaldehyde, phenol, isobutylene, production risk categories as category 1, building fire resistance rating for second-level. Throughout the workshop working with about 20 people per class.

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