One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； June 09
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Single-choice question: When a leak is detected in the liquid-phase pipeline of vinyl chloride monomer and shutdown for maintenance involving hot work is required, the main steps for safe handling after shutdown are in order as follows (). A. Purging, displacement, isolation, cleaning B. Isolation, displacement, purging, cleaning C. Isolation, purging, displacement, cleaning D. Displacement, purging, isolation, cleaning Answer: B. Isolation, displacement, purging, cleaning
D. Displacement, purging, isolation, cleaning
B. Isolation, displacement, purging, cleaning
When a leak is detected in the liquid-phase pipeline of vinyl chloride monomer and shutdown for hot work maintenance is required, the main steps for safe handling after shutdown are in sequence as (D).
When a leak is detected in the liquid-phase pipeline of vinyl chloride monomer and shutdown for welding repairs is required, the main steps for safe handling after shutdown are in sequence as (B). A. Purging, displacement, isolation, cleaning B. Isolation, displacement, purging, cleaning C. Isolation, purging, displacement, cleaning D. Displacement, purging, isolation, cleaning
C. Isolation, purging, displacement, cleaning
C. Isolation, purging, displacement, cleaning