电杆应符合设计规定,其长度偏差为+200mm~-100mm,梢径偏差≤-10mm。
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Mary is always ready to help others when they are in trouble and she never__________ their requests.
A. turns up
B. turns over
C. turns in
D. turns down
Everyone has periods in their lives__________everything seems so hard.
A. when
B. where
C. which
D. that
对于混凝土结构、砌体结构、木结构和钢结构,耐久性耐火性均好的有哪些?
地市公司根据省公司生产技术部门批复的状态检修综合报告启动()编制工作。