单选题
发布日期:2021-03-22
has little or no internal friction
has a lower effective compression ratio
operates with scavenge air under a positive pressure
operates without energy absorbing intake and exhaust strokes
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标志着教育学开始成为一门独立的科学的著作是().
盐酸哌替啶结构中的酯键较稳定是因为()
口蹄疫是单蹄兽的一种传染病。
农业银行营业机构可办理的外汇储蓄币种不包括()。
检查乳糜微粒的染液是( )
关于CT检查防护的解释,错误的是( )
下列选项中,不属于十宣穴主治病症的是()。
材料: 王老师是小学三年级的数学教师,在教授“同一平面上两点之间直线最短”时是这样教学的:他先在黑板上取了在同一平面上的两个点,并作出这两点间的四条线段,其中包括两点间的直线。接着,请一位学生把这几条线段的距离测量出来,写在线段旁,再让其他学生说出哪一条最短。然后,让学生分组自由讨论几分钟,他逐一辅导各组,当学生不会准确概括时.他会引导学生主动思考,并让学生自己得出结论:两点之间直线最短。最后,他用多媒体制作了一幅图,这幅图中有道题要学生独立完成,题目是:一座房子到河边有三条路走,一条直线和两条弯道,问走哪条路最近?由学生主动回答,并说明缘由。 问题: (1)王老师主要遵循了哪一教学原则?该教学原则的内涵是什么?(10分) (2)具体说明贯彻该教学原则的基本要求。(10分)
工法的核心是()。
患者,女,56岁,右下肢静脉迂曲扩张20年,伴下肢酸胀、水肿,活动抬高减轻,近2年右足靴区皮肤发红,时有瘙痒,逐渐加重,右下肢大腿内侧、小腿后见迂曲扩张之静脉团,足靴区色素沉着,皮肤变厚。该患者属于哪一类病变()。
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