基因型为AABBCC的豌豆和aabbcc的豌豆杂交,产生的F2用秋水仙素处理幼苗后得到的植株应该是() ["二倍体","三倍体","四倍体","六倍体"]
机体糖原储备供能仅够1d正常需要量的() ["3/4","2/3","1/2","1/3","1/4"]
关于多巴胺下列哪项正确() ["小剂量多巴胺的血管活性作用可与酚妥拉明拮抗","与α、β1-肾上腺素受体缺乏相互作用","作用于突触后膜的乙酰胆碱受体","可降低肾脏和肠系膜血管床的流量","大剂量多巴胺的血管活性作用可与酚妥拉明拮抗"]
长期肠外营养常见的并发症是() ["胆囊结石","胃癌","肝硬化","Crohn病","肝癌"]
半解剖式人工牙的牙尖斜度是()。 ["10°","15°","20°","25°","30°"]
电除尘阴极线CW09A波形线的特点?