期前收缩的产生机制包括（） A.附加的房室传导束 B.迷走神经张力增高 C.折返激动 发布时间：2017-05-19 19:03 │ 来源：www.tikuol.com 题型：多项选择题 问题： 期前收缩的产生机制包括（）A.附加的房室传导束B.迷走神经张力增高C.折返激动D.触发活动E.异位起搏点的兴奋性增高
题型：多项选择题 完形填空。 A long time 1 people thought the sun went round the earth. In some countries people even said that thesun was a god (神). They thought that he drove across the sky every day 2 a golden horse. Now they know the earth goes round the sun. It 3 the earth a year to go all the way round the sun. Today men even know 4 it is for theearth to go round the sun. They 5 us that the earth travels over a thousand miles a minute on its way roundthe sun. The sun is really a star. It's 6 bigger than the earth and it is very hot. Some people have been to the moon. 7 no one can 8 to the sun. It's 9 hot for people to live anywhere near it. The sun is three hundred 10 times heavier than the earth and more than a million times larger. ( )1. A. before ( )2. A. on ( )3. A. uses ( )4. A. how long ( )5. A. tell ( )6. A. many ( )7. A. Or ( )8. A. live ( )9. A. too ( )10. A. thousands B. ago B. by B. spends B. how much B. say B. much B. So B. leave B. very B. thousand C. front C. with C. takes C. how many C. talk C. a lot of C. And C. go C. much C. thousand of D. once D. in D. brings D. how far D. speak D. more D. But D. pass D. more D. thousands of 查看答案
题型：多项选择题 患者女性，54岁：上腹部隐痛不适1年半，加重3个月入院，上腹痛不规则，偶伴嗳气，饭后饱胀。近一个月体重减轻3公斤，大小便正常，原有慢性萎缩性胃炎病史，体验：消瘦，左锁骨上可扪及一约花米大小淋巴结，质中偏硬。腹平软，剑突下偏左轻压痛，左上腹近剑突下似可扪及一肿块，界线不清，肝脾肋下未及，腹水征（-）。本前应做哪些准备？（）A.输血纠正贫血B.纠正低蛋白血症C.左锁骨上淋巴结活检D.静脉注射执生素E.肠道准备F.应用LAK、Ⅱ-2G.静脉滴注化疗药物H.高盐饮食 查看答案
题型：多项选择题 —What do you want to do ________ those old boxes?—To put things in when I move to the new flat.A．byB．forC．ofD．with 查看答案
题型：多项选择题 红楼梦》第六回“刘姥姥一进荣国府”中，刘姥姥有这么一段话：“我们也是知道艰难的，但俗语说的：“瘦死的骆驼比马大”呢。凭他怎样，你老拔根寒毛比我们的腰还壮哩！”刘姥姥的这段话是对谁说的？为何说这话？请简叙事情的经过。 查看答案