【单选题】已知一圆锥体,D=60MM,d=50mm,l=100mm,它的锥度是()
【单选题】27已知一圆锥体,D=60mm d=50mm I=100mm,它的锥度是( )
【判断题】漏气损失是指由于外部泄漏所造成的能量损失。
【单选题】花序呈伞房状圆锥花序,开张,多花密集,由多数长圆状在果时多少伸长的小穗状花序所组成;苞片长圆状倒卵形至倒卵形或倒披针形,锐尖,绿色或带紫晕,长约5毫米,具平行脉的药物是
【单选题】下列药物中不具有酚羟基,不可与三氯化铁试液作用显色的是
【简答题】图示结构中杆AC与CD均由Q235钢制成,C、D两处均为球铰。已知d=20mm,b=100mm,h=180mm;E=200GPa,σ s =235MPa,σ b =400MPa;强度安全因数n=2.0,稳定安全因数n st =3.0。试确定该结构的许可荷载。
【单选题】I can’t ( ) her endless complaint noise a moment longer.
【单选题】A vessel is found to be seaworthy after a complaint in writing to the American Consul by the Chief and Second Mates. The cost of the survey is to be paid by the ______.
B.
Chief and Second Mates
【判断题】We can only make a complaint face to face.