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【判断题】
酸碱指示剂是一类结构复杂的有机物。随溶液的 pH 值不同,而显示不同的颜色。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】This memorial was built _______ those heroes who laid down their lives for the liberation of the poor people. [ ]
A.
in memory of
B.
to remember
C.
for the memory of
D.
to the memory of
【简答题】双打战术和单打战术的区别有哪些?
【单选题】Migration is usually defined as 'permanent or semipermanent change of residence'. This broad definition, of course, would include a move across the street or across a city. Our concern is with movemen...
A.
are all related to economic considerations
B.
are not as decisive as push factors
C.
include a range of considerations
D.
are more important than push factors
【简答题】单打发球的种类及战术作用有哪些?
【单选题】Migration is usually defined as 'permanent of sempermanent change of residence'. This broad definition, of course, would include a move across the street or across a city. Our concern is with movement...
A.
unemployment
B.
famine
C.
weather
D.
war
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