患者男,59岁,因“突发剧烈头痛、呕吐,偏瘫2h”来诊。颅脑CT:右侧基底核区不规则高密度影,边界清,CT值72HU,周围可见低密度水肿区,右侧脑室受压,中线结构左移。本病第20天复查MR,最可能的的表现是() ["A.T1WI和T2WI均呈高信号,周围无低信号环","T1WI和T2WI可呈等信号或低信号","T1WI和T2WI上病变周围信号增高,中心信号稍低","T1WI呈低信号,T2WI呈高信号","T1WI和T2WI上均呈高信号,周围有明显的低信号环"]
摇转曲轴时有反转现象,猛加油门有爆震声,是()的现象。 ["A、点火时间过早","B、点火时间过迟","C、高压火花弱","D、高速不良"]
关于瑞氏染色,错误的说法是() ["室温越高,染色时间越短","先倒去染液,再用流水冲洗","细胞数量越多,染色时间越长","染液浓度越高,染色时间越短","用缓慢的流水冲去染液"]
对瑞氏染色的介绍,正确的说法是() ["偏碱性环境中染色偏蓝","偏酸性环境中染色偏蓝","偏碱性环境中负电荷增多","偏酸性环境中正电荷增多","偏碱性环境中易与伊红结合"]
气体混合物中吸附剂在一定温度和浓度下,达到吸附平衡时,单位体积或重量的吸附剂所能吸附的最大量是指() ["动活性","静活性","吸附量","填充量"]
简述大肠癌(结肠癌、直肠癌)的诊断及诊断依据。