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【单选题】
如图，数轴上A、B两点对应的实数分别是1和 3 ，若点A关于点B的对称点为点C，则点C所对应的实数为（ ）A.
2 3 -1
B.
1+ 3
C.
2+ 3
D.
2 3 +1
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举一反三
【简答题】B When the population of the port town began to suffer from poisoning, the police came to find the cause of the poison．They thought someone was poisoning the people on purpose but no one knew how it w...
【简答题】静脉输液(intravenous infusion)
【简答题】翻译 intravenous:A.
【单选题】General anesthesia can be divided into intravenous anesthesia, _____,and combined intravenous and inhalation anesthesia
A.
inhalation anesthesia
B.
intraspinal anesthesia
C.
local anaesthesia
D.
peripheral nerve block
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