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【单选题】
最常见的化脓性细菌是A.
丙型链球菌
B.
金黄色葡萄球菌
C.
表皮葡萄球菌
D.
淋病奈瑟菌
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【简答题】在医药上常用一些难溶的氢氧化物和碳酸盐来治疗胃酸过多症。下面是一种医用药品瓶上的标签，试根据标签上的内容回答有关问题。 (1)药物中的“铝”指的是 (填化学式) (2)“咀嚼”后咽下，有两种好处。请加以叙述 ①： ②： 。 (3)当胃酸过多时，服用该药片后，在胃中可能发生的化学反应有哪些? (用化学方程式表示) ； 。
【单选题】a green house is a building made of glass which is used for keeping plants warm when the outside temperature is low. In a similar way there are several gases in the atmosphere which trap the heat prod...
A.
the way in which gases are used for keeping plants warm
B.
a natural course which is to some degree helpful to us.
C.
the way greenhouse gases trap heat on the earth
D.
the whole course in which greenhouse gases prevent heat .
【简答题】The air filter is used on engine to trap contaminants, yet provide a free flow of air into the engine.
【判断题】The air filter is used in the engine to trap contaminants, yet provide a free flow of air into the engine. Air filters which are usually used in cars are made of paper element. These filters permit ai...
A.
正确
B.
错误
【简答题】影响变压器连接组别的因素有_ __、_ _和_ _。
【简答题】影响变压器连接组别的因素有____、____、____。
【简答题】A trap is used to _____________________
【简答题】按分离机制的不同,色谱法可分为:A. 分配色谱法 B.吸附色谱法 B. 凝胶色谱法 C. 离子交换色谱法 E.平面色谱法
【单选题】A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.
A.
a flame trap
B.
a relief valve
C.
a fusible plug
D.
a bursting cap
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