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【单选题】
采用高效液相色谱法测定片剂中阿司匹林的含量是因为( )A.
操作简便
B.
阿司匹林具有酸碱两性
C.
片剂中有其他酸性物质
D.
片剂中有其他碱性物质
E.
需碱定量水解
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【单选题】When the tank can carrying poisonous gas ran off the rails the firemen tried to______ the village from all traffic.
A.
dismiss
B.
insulate
C.
isolate
D.
expel
【简答题】B I find it annoying and funny when I think about how we use protective or decorative wrappings ' (装饰性包装)in this country. When I come home from the supermarket and start to unpack, I am always shocked...
【单选题】The firemen tried their best to _______ the fire but in vain.
A.
put up
B.
put forward
C.
put down
D.
put out
【简答题】有色金属可以分为几类？
【单选题】The 19th-century scholars tried to ______ the origins of modern languages to ancient Hebrew.
A.
tracing
B.
tracking
C.
strolling
D.
stumbling
【简答题】已知A由一种或几种金属组成，为确定A的组成，进行如下图所示的实验（部分产物巳略去）．已知B、E均为只含一种溶质的溶液，E溶液呈蓝色，C、D均为纯净物． （1）G是 _________ （填名称）． （2）①处发生的反应属于 _________ （填基本反应类型）． （3）写出有关反应的化学方程式：② _________ ；④ _________ ． （4）根据以上信息，对A的组成作出的判断正确的是...
【单选题】The shop girl almost called me stupid when I said that camera wasn't to my ______ and a bit cheap-looking.
A.
astonishment
B.
taste
C.
delight
D.
knowledge
【简答题】Firemen tried to ________________ (扑灭) the fire and save the injured.
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