开式司机室应设有高度不小于1050mm的栏杆,并应可靠地围护起来,司机室内净空高度不应小于()m。 ["A、1","B、2","C、3","D、4","E、3.5","F、0.4","G、0.8","H、0.2","I、0.63","J、0.5"]
弱树脂的交换反应速度较强树脂()。
试述作物产品品质的影响因素和改善品质的途径
有上升而无降落原因可能是()触头损坏或接触不好。 ["A、转动","B、主令控制器","C、偏心","D、变幅","E、主起升","F、过流保护","G、超速保护","H、短路保护","I、过压保护","J、欠压保护"]
鼓风式除CO2器一般可将水中CO2含量降至()以下。
丝绸衣料如粘上杂物时怎么办?