车外圆分粗、精车的目的是什么?
正常肾内围绕着肾窦的回声较低的结构是 ["A.肾实质","B.肾皮质","C.肾髓质","D.肾小盏","E.肾柱"]
按计划内容划分的计划有() ["基层计划","长期计划","专项计划","财务计划","综合计划"]
按计划所涉及的时间划分的计划有() ["长期计划","生产计划","中期计划","短期计划","综合计划"]
胃平滑肌瘤的超声表现是: ①胃壁可见类圆形肿块,边界清,内部回声较均匀; ②肿块部位胃黏膜正常; ③CDFI检查肿块可见血供; ④胃蠕动正常 ["A.①②③","B.①③","C.②④","D.④","E.①②③④"]
什么是春化作用?如何证实植物感受低温的部位是茎尖生长点。