【单选题】患者男,27岁,既往有消化道溃疡病史4年,突发上腹部刀割样疼痛,迅速蔓延至全腹,服抗生素后不能缓解,症状加重,6h后于急诊求治。经腹部X线平片诊断为:急性弥漫性腹膜炎,消化性溃疡穿孔。引起继发性腹膜炎的细菌中,最多见的是()
【单选题】图示系统 AB 杆与铅直线夹角为 θ , AB 为均质杆,圆销 C 是固定的,无摩擦。下述说法正确的是( )
A.
能使AB杆平衡的θ值不是唯一的,而是在某一个范围。
C.
只要AB杆的重心在销子C的外侧(即在BC之间),则任意小于90度的θ值都能使AB杆平衡。
【简答题】Look at the picture. This is our school. There are five buildings in our school. There are thirty-two classrooms in the Teaching Building. Our gym is behind the Teaching Building. The teacher’s office...
【简答题】Your company requires new office and warehouse premises. You have been asked to look at two office and warehouse properties, after adverts for these properties were sent to you by a commercial propert...
【单选题】They had a good talk last night, which had ______three hours before they knew it.