单项选择题
When he came to, he found himself ______ on a chair, wi...
单项选择题When he came to, he found himself ______ on a chair, with his hands ______ back. A.to sit/tying B.sitting/tying C.seating/tied D.seated/tied
某预应力混凝土构件中,预应力钢筋初始应力为317MPa,一段时间后测得钢筋的应力为308MPa,则该预应力钢筋...
单项选择题某预应力混凝土构件中,预应力钢筋初始应力为317MPa,一段时间后测得钢筋的应力为308MPa,则该预应力钢筋的应力松弛率为（ ）%。
按照ASTM F42的分类，增材制造技术有7种成型工艺：容器内光聚合、粉末床烧结/熔化、片层压、黏结剂喷射、材...
问答题按照ASTM F42的分类，增材制造技术有7种成型工艺：容器内光聚合、粉末床烧结/熔化、片层压、黏结剂喷射、材料挤压、材料喷射和[填空(1)] 。
