桥梁施工用的普通钢筋,钢筋的纵向焊接应采用() ["气压焊","电弧焊","电渣压力焊","闪光对焊"]
下列哪种不是家蚕微粒子病的传染来源() ["病蚕的尸体","病蚕排出的粪便","病蚕的卵壳","病蚕的蚕茧","蚕蛹"]
莱菔子具有的药理作用是() ["助消化","抑制泌乳素","镇咳","祛痰","抗菌"]
患者,女,31岁。眉棱骨痛,鼻塞,香臭不闻,流浊涕。治疗应选的药物是()。 ["藿香","薄荷","荆芥","辛夷","紫苏"]
检测器具的测量极限误差,()被测对象所能允许的测量极限误差。 ["必须等于","必须小于","不得大于","不得等于"]
什么叫在线清洗?