A provincial stationary engineer licence, compressor operator or refrigeration certificate may be required when certain kinds of equipment are included in the process.
当某些类型的设备包含在该过程中时，可能需要省级固定工程师执照，压缩机运营商或制冷证书。
A provincial stationary engineer licence, compressor operator or refrigeration certificate may be required when certain kinds of equipment are included in the process.
当某些类型的设备包含在该过程中时，可能需要省级固定工程师执照，压缩机运营商或制冷证书。
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