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听力原文: How many of you drink cola? Nearly everyone. Did you know that cola started out not as a soft drink but as a cure for headaches back in the late 1800's? john S Pemberton, a druggist from Atlanta, had experimented for many months trying to find a cure for the common headache. He worked in his backyard, mixing and heating different combinations of oils and flavors until he found one that seemed promising. Pemberton bottled the mixture and began selling it in drug stores as concentrated syrup that the customer had to mix with water before drinking. Cola's transformation from medicinal syrup to a carbonated soft drink came about quite by accident. One day, a customer came into a drugstore complaining of a headache and asked for a bottle of cola syrup. He wanted to take it right away. So he asked the clerk to mix the medicine while he waited. The clerk, instead of walking to the other end of the counter to get plain water, suggested mixing the syrup with soda water. The customer agreed, and after drinking it, remarked how good it tasted. The clerk continued offering the mix and carbonated cola grew in popularity. Today carbonated colas are sold in most countries around the world. And although they no longer contain the ingredients used to cure headache, they are still very refreshing. (29)
A.
Softdrink production.
B.
A recipe for a soft drink.
C.
The medicinal effects of cola.
D.
The history of cola.
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【判断题】异步电动机额定运行时,转子频率远小于定子频率。
A.
正确
B.
错误
【单选题】对兴奋性突触后电位的叙述,错误的是
A.
突触前神经元释放兴奋性递质
B.
突触后膜产生除极化变化
C.
突触后膜对Ca2+通透性增加
D.
主要使突触后膜Na+内流
E.
兴奋只能由前膜向后膜传递
【判断题】化工设备图一般采用三个基本视图。
A.
正确
B.
错误
【单选题】下列对兴奋性突触后电位的叙述,错误的是
A.
突触前神经元释放兴奋性递质
B.
突触后膜产生局部除极
C.
突触后膜主要对Ca2+通透性增加
D.
主要使突触后膜Na+内流增加
E.
兴奋一般是由前膜向后膜,呈单向传递
【判断题】兴奋性突触后电位,是兴奋性突触的突触前神经元释放兴奋性递质,提高突触后膜对K + 和Cl + 通透性引起的。( )
A.
正确
B.
错误
【单选题】(四)阅读下面的材料,完成第 24 - 25 题。 寒蝉凄切,对长亭晚,骤雨初歇。都门帐饮无绪。留恋处兰舟催发。执手相看泪眼,竟无语凝噎。念去去千里烟波,暮霭沉沉楚天阔。 多情自古伤离别,更那堪冷落清秋节!今宵酒醒何处?杨柳岸,晓风残月。此去经年,应是良辰好景虚设。便纵有千种风情,更与何 24《 雨霖铃》词牌名 , 也写作《雨淋铃》,曲调自身就具有哀伤的成分,相传与哪两位历史人物的故事有关?( )
A.
唐玄宗、杨玉环
B.
梁山伯、祝英台
C.
唐伯虎.秋香
D.
牛郎.织女
【单选题】三相异步电动机在额定转速附近运行时,其转子电流的频率值( )。
A.
远大于定子电流频率
B.
稍小于定子电流频率
C.
远小于定子电流频率
D.
等于定子电流频率
【单选题】三相异步电动机在额定转速附近运行时,其转子电流的频率值
A.
等于定子电流频率
B.
远 大于定子电流频率
C.
稍 小于定子电流频率
D.
远 小于定子电流频率
【单选题】下列对兴奋性突触后电位的叙述,错误的是
A.
突触前神经元释放兴奋性递质
B.
突触后膜产生局部去极化
C.
突触后膜主要对Ca2+通透性增加
D.
主要使突触后膜Na+内流增加
E.
兴奋一般是由前膜向后膜,呈单向传递
【单选题】对兴奋性突触后电位的叙述,错误的是
A.
突触前神经元释放兴奋性递质
B.
突触后膜产生去极化变化
C.
突触后膜对Ca2+通透性增加
D.
主要使突触后膜Na+内流
E.
兴奋只能由前膜向后膜传递
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