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【单选题】
谨:谨庠序之教 ( )A.
谨:形—动 认真从事
B.
形容词 谨慎
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皮皮学刷刷变学霸
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【简答题】牙膏的主要成分有()()()()()()
【简答题】_______ (accurate) of singing depends upon th precision with which the singer can voluntarily adjust the contractions of the muscles related to sound .
【单选题】A user is experiencing headaches and motion sickness symptoms when using their new computermonitor. Which of the following can a technician adjust to help the user?（）
A.
Privacy filter
B.
Refresh rate
C.
Use a digital signal
D.
Brightness