与可燃性气体爆炸相比,粉尘爆炸具有()等特点。 ["A、压力上升较慢","B、较高压力持续时间长","C、释放的能量大","D、释放的能量较小","E、破坏力强"]
胎教
砂浆的保水性用()。 ["稠度","分层度","强度","沉入度"]
处于低温下的焊接结构应选用() [" 耐腐蚀的钢材 "," 喊磷的钢材 "," 韧性好的钢材 "," 强度高的钢材"]
下列()不属于蒸压加气混凝土砌块的特点及适应范围。 ["保温性能好","隔热性能好","可应用于多层建筑物的承重墙","有利于提高建筑物抗震能力"]
唐氏综合症