题型:不定项选择 光滑的水平面上放有质量分别为m和的两木块,下方木块与一劲度系数为k的弹簧相连,弹簧的另一端固定在墙上,如图所示。已知两木块之间的最大静摩擦为f,为使这两个木块组成的系统能像一个整体一样地振动,系统的最大振幅为[ ]A.B. C.D. 查看答案
题型:单项选择题 A2型题 患者,女性,45岁,既往有肺结核病史,近一个月来腰部疼痛,伴咳嗽,低热,盗汗,X线:T、L椎体有1/3压缩,椎间隙狭窄。下列哪项治疗不恰当()A.规范抗结核治疗B.卧床休息C.全身支持疗法D.立即手术治疗,清除病灶E.注意检查有无其他部位结核 查看答案
题型:选择题 Totally _____ accident, the businessman got hold of a ten-pound fake banknote that was believed to ______ two hundred years ago. A.by; have been issuedB.with; have come into use C.in; have come out D.at; have come into being 查看答案