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【单选题】
石墨炉原子化法测定的主要缺点是().A.
灵敏度较低
B.
不适于测定难挥发物质
C.
精密度低
D.
不能直接测定固体样品
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举一反三
【单选题】It seems that_____ is the musical instrument used throughout the history of blues.
A.
saxophones
B.
brasses
C.
guitars
D.
drums
【单选题】By an ohmmeter ______ the instrument used to measure resistance.
A.
mean
B.
means
C.
is meant
D.
are meant
【单选题】______ is the instrument used for indicating direction.
A.
Compass
B.
Paper
C.
gun powder
D.
Printing
【判断题】The tone in Kennedy’s Inaugural Address is appropriate because he uses different tones to address different groups of nations.
A.
正确
B.
错误
【简答题】“食品的食用性能”是指食品的营养价值、（ ）和卫生安全。
【单选题】The instrument used by doctors to listen to patients' heart or beating is called __________.
A.
laryngoscope
B.
stethoscope
C.
otoscope
D.
arthroscope
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