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【多选题】
研究牙齿外伤的目的在于：A.
针对不同类型的外伤特点，分析可能的预后及相关因素
B.
正确救治牙外伤，尽量避免并发症的出现
C.
对于已出现并发症的牙齿施行有效地治疗措施
D.
避免或减少牙齿外伤对儿童颌骨及身心发育的影响
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反馈参考答案：
举一反三
【单选题】On a tank vessel, which of the following substances would be burning in a class 'B' fire?
A.
Oil
B.
Wood
C.
Rags
D.
Electrical wiring
【简答题】What did Bill Gates like to do in college?
【单选题】What did Bill Gates do at Harvard University?
A.
He formed the ''Programmers Group'' at Harvard University.
B.
He developed a small computer to measure traffic flow.
C.
He spent many long nights in front of the school’s computer.
D.
He discussed with his classmates about starting a new business.
【单选题】Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?
A.
Sludge
B.
Gasoline
C.
Fuel oil
D.
Lube oil
【单选题】What did Bill Gates do at Harvard University?
A.
He developed a small computer to measure traffic now .
B.
He formed the “Programmers Group” at Harvard University .
C.
He spent many long nights in front of the school’s computer .
D.
He discussed with his classmates about starting a new business .
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