回复: 累脖必备WHMIS知识
是关于What is a Class A - Compressed Gas?
What is a Class B - Flammable and Combustible Material?
What is a Class C - Oxidizing Materials?
What is a Class D - Poisonous and Infectious materials?
What is a Class E - Corrosive Material?
What is a Class F - Dangerously Reactive Materials?
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