施加均布荷载的方法有()。
A.气压加载和重物加载
B.重物加载和液压加载
C.激振器加载和气压加载
D.重物加载和机械式加载
参考答案:A
The students were sitting in the classroom with their eyes on the teachers.
A.fixing
B.fixed
C.were fixed
D.being fixed
男性,20岁,患过敏性哮喘急性发作前来就诊。体检见患者严重呼吸困难伴轻度发绀,两肺满布哮鸣音,心率110次/分,下列治疗不作为首选的是()
A.脱(减)敏治疗
B.应用激素
C.应用β2受体激动剂
D.补液
E.吸氧