问题
单项选择题
可以用微量升华方法进行鉴别的中药材是
A．大黄
B．太子参
C．附子
D．地榆
E．山药
答案
参考答案：A
解析： 本题考查中药材的理化鉴定方法。高温则得羽状结晶。 大黄可用微量升华法，可见黄色菱状针晶或羽状结晶，加碱液显红色。
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可以用微量升华方法进行鉴别的中药材是
A．大黄
B．太子参
C．附子
D．地榆
E．山药
参考答案：A
解析： 本题考查中药材的理化鉴定方法。高温则得羽状结晶。 大黄可用微量升华法，可见黄色菱状针晶或羽状结晶，加碱液显红色。
The bullet (子弹头) train D106 from Changsha to Shanghai has a short stop in Quzhou for only one minute. Named 21 the letter D, the new trains run at speeds of 200 to 250 kilometers one hour. This is much 22 than Z-type and T-type trains. For example, it 23 take people 12 hours to travel from Shanghai to Beijing. But now it only 24 10. The most interesting part of the bullet trains is the revolving (旋转的) seats. People can adjust (调整) their seats as they like, so that it is 25 for you to talk with others around you face to face. The new trains run 26 big cities. They 27 the long trips much faster and more comfortable. However, many passengers still won’t choose the bullet trains 28 some reasons. The ticket 29 of the bullet trains are much higher. For example, a hard seat ticket from Beijing to Jinan is only 90 yuan for T-type trains. But on the bullet trains all the seats are 30 . And they cost 153 to 184 yuan. On the other hand, the bullet trains don’t stop at small stations.
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