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【单选题】
患者女性,20岁,患急性蜂窝组织炎入院,行抗炎、对症治疗。下列那一部位需尽早切开减压
A.
口底、颔下
B.
手部
C.
大腿内侧
D.
下腹部
E.
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A.
26
B.
40              
C.
58             
D.
90
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A.
There are one hundred and fifty teachers in my school.
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There is one hundred and fifty teachers in my school.
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【单选题】一定条件下,一定量的化合物A和O 2 恰好完全反应,生成44gCO 2 和9gH 2 O,则A物质的化学式可能是 [     ]
A.
CH 4
B.
C 2 H 5 OH
C.
C 2 H 4
D.
C 2 H 2
【简答题】一定条件下,一定量的化合物M和O 2 恰好完全反应,生成44gCO 2 和9gH 2 O。请回答下列问题: (1)化合物M中一定含有的元素是 (填元素符号),其质量比依次为 ; (2)化合物M的相对分子质量不可能是 (填选项序号)。 A.26 B.40 C.58 D.90
【单选题】一定条件下,一定量的化合物A和O 2 恰好完全反应,生成44gCO 2 和9gH 2 O,则A物质的相对分子质量不可能是 [     ]
A.
26
B.
40
C.
58
D.
90
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