单选题原位癌的特点不包括______

单选题关于兴奋性突触后电位(EPSP)产生的叙述，哪一项是错误的( ) A．突触前轴突末梢去极化 B．Ca2+由膜外进入突触前膜内 C．突触小胞释放递质，并与突触后膜受体结合 D．突触后膜对Na+、K+、Ca2+，特别对K+的通透性升高 E．突触后膜产生去极化

单选题 单分体出现在 ( ) A、减数分裂后期I B、减数分裂中期Ⅱ C、减数分裂后期Ⅱ D、减数分裂前期Ⅱ E、减数分裂末期Ⅱ

单选题真核生物DNA复制时，减少染色体DNA5ˊ末端区降解或缩短的方式是

单选题肌的初长度取决于( ) A．前负荷 B．后负荷 C．前后负荷之间 D．前后负荷之差 E．主动张力大小

单选题A．肌凝蛋白B．肌纤蛋白C．肌钙蛋白D．钙调蛋白E．肌凝蛋白激酶

单选题用作衡量组织兴奋性高低的指标通常是

单选题 目前，遗传病的手术疗法主要包括 ( ) A、手术矫正和器官移植 B、器官组织细胞修复 C、克隆技术 D、推拿疗法 E、中医治疗

单选题第二性征的发育是指( ) A．生殖器官的发育 B．体态和身高的发育 C．男、女性所特有的外部特征 D．腋毛、阴毛的出现 E．音调的变化

单选题在生理情况下，对动脉血压影响不大的因素是

单选题After World War Ⅱ the glorification of an ever-larger GNP formed the basis of a new materialism, which became a sacred obligation for all Japanese governments, businesses and trade unions. Anyone who mentioned the undesirable by-products of rapid economic growth was treated as a heretic. Consequently, everything possible was done to make conditions easy for the manufacturers. Few dared question the wisdom of discharging untreated waste into the nearest water body or untreated smoke into the atmosphere. This silence was maintained by union leaders as well as by most of the country's radicals; except for a few isolated voices, no one protested. An insistence on treatment of the various effluents would have necessitated expenditures on treatment equipment that in turn would have given rise to higher operating costs. Obviously, this would have meant higher prices for Japanese goods, and ultimately fewer sales and lower industrial growth and GNP. The pursuit of nothing but economic growth is illustrated by the response of the Japanese government to the American educational mission that visited Japan in 1947. After surveying Japan's educational program, the Americans suggested that the Japanese fill in their curriculum gap by creating departments in chemical and sanitary engineering. Immediately, chemical engineering departments were established in all the country's universities and technical institutions. In contrast, the recommendation to form sanitary engineering departments was more or less ignored, because they could bring no profit. By 1960, only two second-rate universities, Kyoto and Hokkaido, were interested enough to open such departments. The reluctance to divert funds from production to conservation is explanation enough for a certain degree of pollution, but the situation was made worse by the type of technology the Japanese chose to adopt for their industrial expansion. For the most part, they simply copied American industrial methods. This meant that methods originally designed for use in a country that stretched from the Atlantic to the Pacific with lots of air and water to use as sewage receptacles were adopted for an area a fraction of the size. Moreover, the Japanese diet was much more dependent on water as a source of fish and as an input in the irrigation of rice; consequently discharged wastes built up much more rapidly in the food chain.

单选题刺激迷走神经，其末梢释放乙酰胆碱，可以引起( )(1995年)

单选题下列诱发肝性脑病的因素中最常见的是

单选题在射血期时，心腔内压力变化是( ) A．房内压＞室内压＞动脉压 B．房内压＜室内压＜动脉压 C．房内压＞室内压＜动脉压 D．房内压＜室内压＞动脉压

单选题细菌蛋白的翻译过程包括①mRNA，起始因子，以及核蛋白体亚基的结合；②氨基酸活化；③肽键的形成；④肽酰-tRNA移位；⑤GTP，延长因子以及氨基酰-tRNA结合在一起等步骤。它们出现的恰当月顺序是

单选题下列选项中，符合黏膜相关淋巴组织淋巴瘤叙述的是

单选题下列哪种疾病不易引起玻璃样变性

单选题生理情况下，人的中心静脉压升高时见于( )(2011年)

单选题下列哪种物质不易通过血脑屏障 A.氨基酸 B.CO2 C.去甲肾上腺素 D.葡萄糖

单选题下列哪项不是胆碱能神经纤维______