皮皮学,免费搜题
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【单选题】
尿毒症患者发生纤维性骨炎的主要原因是
A.
尿钙排泄增多
B.
继发性甲状旁腺功能亢进
C.
尿磷排泄减少
D.
肾功能低下
E.
活性维生素D合成障碍
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【多选题】关于条件反射,正确的描述是
A.
先天遗传的
B.
通过后天训练、学习获得
C.
维持生命本能活动
D.
使机体有预见性
E.
食物刺激口腔引起唾液分泌
【单选题】放在手心里就能熔化的稀有金属--镓,其沸点为 2403 °C,更奇妙的是镓熔化后在- 120 °C仍不易凝固;在常温下几乎不与氧气和水反应,但能溶于强酸和强碱;与其他金属熔合可改善合金的性能;与硫、硒等非金属化合可生成优质半导体材料。有关镓的用途叙述错误的是( )
A.
常温下镓的表面易形成一层氧化膜
B.
制作高温温度计
C.
制晶体管材料
D.
金与镓的合金用于镶牙
【单选题】下列关于条件反射描述正确的是( )
A.
条件反射是后天建立的,与非条件反射无关。
B.
把无关刺激转变为条件刺激的过程称为强化
C.
“望梅止渴”的现象是人类特有的
D.
条件反射一旦建立则永远无法消退
【简答题】A.People are rarely interested in the same kind of news. B.People have different views about what a good newspaper is. C.People scan for the news they are interested in. D.Different people prefer diff...
【单选题】下列有关硅及其化合物的说法正确的是
A.
单质硅常用作半导体和光导纤维材料
B.
硅在自然界中只以化合态的形式存在
C.
SiO 2 与纯碱高温生成CO 2 ,说明硅酸的酸性比碳酸强
D.
SiO 2 是非金属氧化物,它不与任何酸反应
【简答题】A.People are rarely interested in the same kind of news. B.People have different views about what a good newspaper is. C.People scan for the news they are interested in. D.Different people prefer diff...
【单选题】下面关于条件反射的描述,正确的是()
A.
经典条件反射由法国生理学家发现
B.
又称巴甫洛夫反射
C.
给狗喂食引起唾液分泌是条件反射
D.
是先天就具有的动物本能
E.
任何无关刺激与非条件刺激结合一次就可形成条件反射
【单选题】Rarely ______ their facilities to the full while many disabled people manage to make the best use of their senses.
A.
able people use
B.
able people do use
C.
do able people use
D.
do use able people
【单选题】The student thinks people ______.
A.
like the advantages of the suburbs.
B.
rarely go into the city for entertainment.
C.
enjoy living in the city.
【单选题】Although often extremely critical of the medical profession as a whole, people are rarely willing to treat their personal doctors with equal ______.
A.
impulse
B.
sarcasm
C.
mockery
D.
contempt
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