【单选题】某男, 72 岁,因 “ 胸闷、气促,伴咳嗽咳痰半年 ” 入住某院心胸外科。入院后胸部 CT 示 “ 慢支、肺气肿,右肺肺大疱,右侧气胸,双上肺结核 ” ,予第一次行胸腔闭式引流术,有执行的医护人员签字,有收费,第二次行《临时医嘱单》有胸腔闭式引流术的记载,无执行的医护人员签字,有收费。术后气促症状明显好转,患方要求出院,予签字后带右胸引流管出院。出院半个月后因肺部疾病致呼吸循环衰竭死亡。上述该例...
【单选题】Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdraw...
A.
both spheres are neutral
B.
L is negative and M is positive
C.
both spheres are positive
D.
L is positive and M is negative