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已知：H 2 O(g)==H 2 O(l) △H 1 =－Q 1 kJ·mol － 1 (Q 1 ＞0) C 2 H 5 OH(g)==C 2 H 5 OH(l) △H 2 =－Q 2 kJ·mol － 1 (Q 2 ＞0) C 2 H 5 OH(g)+3O 2 (g)==2CO 2 (g)+3H 2 O(g) △H 3 =－Q 3 kJ·mol － 1 (Q 3 ＞0) 依据盖斯定律，若使23g液态乙醇完全燃烧并恢复至室温，则放出的热量为(单位：kJ)A.
Q 1 +Q 2 +Q 3
B.
0.5(Q 1 +Q 2 +Q 3 )
C.
0.5Q 1 －1.5Q 2 +0.5Q 3
D.
1.5Q 1 －0.5Q 2 +0.5Q 3
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A.
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B.
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【单选题】理想低通滤波器是( )
A.
物理可实现的
B.
非因果的
C.
因果的
D.
不稳定的
E.
:B
F.
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G.
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I.
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J.
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