各级维护部门需建立详细的档案资料?
早期胃癌中,小胃癌是指直径() ["<5mm","5~10mm","10~15mm","15~20mm",">20mm"]
通常用差动变压器传感器测量()。 ["位移","振动","加速度","厚度"]
属于胃癌溃烂而引起的症状是() ["乏力","上腹痛","恶心","发热","饱胀感"]
下列哪项不是胎盘剥离征象() ["宫底升高","宫体变硬,呈球形","外露之脐带下降","于耻骨联合上方压子宫下段,脐带回缩","阴道少量流血"]
一般常规调节系统在负荷变动或工况变动较大时为什么调节质量会变坏?如何解决?