Which of the requirements must be observed by construction workers belonging to special types of work (such as, aerial work, electricians, welders, etc.)?

Which of the requirements must be observed by construction workers belonging to special types of work (such as, aerial work, electricians, welders, etc.)?
A . Pass the prescribed safety technology training and assessment, and hold the corresponding employment certificate
B . Only need to pass the prescribed safety technology training assessment, no certificate required
C . Very experienced, no training and employment permits are required.

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Answer: A