未经（）签字，建设单位不拨付工程款，不进行竣工验收。
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高分子材料阻燃化技术主要通过（）使聚合物不易着火，即使着火也使其燃烧速度变慢。
根据有关危害辨识、风险评价和风险控制策划的要求，生产经营单位在（）时，要进行危害辨识和风险评价。
Which of the following is not a region of developed industrialization mentioned in this passage？
According to the passage,which of the following statements is NOT true？（）
A. Knitting helps one get rid of bad habits.
B. Knitting helps one get free from a bad mood.
C. Knitting requires patience.
D. Knitting is a profit-making business.
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