【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。
【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( )
B.
只要AB杆我的重心在销子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。
D.
能使AB杆平衡的θ值不是唯一的,而是在某一个范围。
【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.