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【单选题】
以下不属于引起蛋白质变性的因素的是A.
强酸
B.
强碱
C.
高温
D.
低温
E.
重金属离子
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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
【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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