Mobile crane operator trade certification is compulsory in Quebec, Ontario, Manitoba and Alberta and available, but voluntary, in all other provinces, Nunavut and the Northwest Territories.是什么意思_Mobile crane operator trade certification is compulsory in Quebec, Ontario, Manitoba and Alberta and available, but voluntary, in all other provinces, Nunavut and the Northwest Territories.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句