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【单选题】
产生原子吸收光谱线的多普勒变宽的原因是( )
A.
原子的热运动
B.
原子在激发态时停留的时间
C.
外部电场对原子的影响
D.
原子与其它原子或分子的碰撞
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【单选题】L7(8B) 表示( ) prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
7 号非框架梁, 8 跨,其中两跨为悬挑梁 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
B.
7 号框架梁, 8 跨,两端为悬挑梁 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
7 号连梁, 8 跨,其中两跨为悬挑梁 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
D.
7 号连梁, 8 跨,两端为悬挑梁,悬挑梁不计入 8 跨内
【单选题】English people ___________ use “Mr” before a person’s given name.
A.
never
B.
usually
C.
often
D.
sometimes
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A.
商品采购
B.
网络营销
C.
物流配送
D.
人员管理
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A.
CREATE INDEX NAME_IDX (first_name, last_name);
B.
CREATE INDEX NAME_IDX (first_name AND last_name);
C.
CREATE INDEX NAME_IDX   ON (first_name, last_name);
D.
CREATE INDEX NAME_IDX   ON employees (first_name AND last_name);
E.
CREATE INDEX NAME_IDX   ON employees(first_name, last_name);
F.
CREATE INDEX NAME_IDX   FOR employees(first_name, last_name);
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A.
信号
B.
数据
C.
编码
D.
介质
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A.
it very easy to do
B.
it very easy done
C.
very easy for doing
D.
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A.
it is necessary for people to use phone calls, instant messages and direct photo shots via the mobile
B.
unlike phone calls, instant messages and direct photo shots via the mobile, postcards are not functional
C.
it is necessary for people to use postcards in spite of the convenience provided by other devices
D.
postcards are completely the same as phone calls, instant messages and others
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