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【简答题】
（11分）甲元素的原子序数是9，元素期表第三期中金属性最强的元素，丙元素原子核外有三个电子层，最外层电子层上有6个电子，丁元素比丙多一个质子，由此推断： （1）甲元素在期表中位于第二期的_________族 （2）甲元素的气态氢化物的稳定性比HCl的_________（填“强”或“弱”） （3）乙元素单质在空气中燃烧，生成一种淡黄色的固体的名称是_________ ，指出它所含的化学键的类型_______________________。 （4）乙元素原子半径比丙元素原子_________（填大或小） （5）丙元素最高价氧化物的水化物的分子式是_________，它的酸性比磷酸的_________（ 填“强”或“弱”） （6）另有A，B，C三种短期元素，A和B同期，A和C同主族，三者的原子序数之和为41，三者的最外层电子总数为19，则推断出的元素依次为A________B________C________.（填元素符号）
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A.
Working at the office is safer than staying at home.
B.
Travelling to work on public transport is safer than working at the office.
C.
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D.
Working in the chemical industry is safer than traveling by air.
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A.
正确
B.
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【单选题】形成漏出液的常见原因,正确的是
A.
主要由局部血管通透性升高所致
B.
主要由白细胞回流增大所致
C.
主要由局部血管内渗透升高所致
D.
主要由钠水潴留所致
E.
主要由血管活性物质增高所致
【单选题】形成漏出液的常见原因正确是
A.
主要由局部血管通透性升高所致
B.
主要由白细胞回流增大所致
C.
主要由局部血管内渗透升高所致
D.
主要由钠水潴留
E.
主要由毛细血管静压增高所致
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