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【单选题】
在下列三个反应中，过氧化氢(H 2 O 2 )所起的作用是 [ ] ①H 2 O 2 +H 2 S===2H 2 O+S↓②2H 2 O 2 2H 2 O+O 2 ↑③H 2 O 2 +Cl 2 ==2HCl+O 2 ↑A.
均是氧化剂
B.
均是还原剂
C.
均既是氧化剂又是还原剂
D.
三个反应中所起作用各有不同
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【单选题】心肌梗死的叙述哪项不确:
A.
血清肌酸磷激酶升高
B.
胸痛持续而剧烈Q波
C.
心电图出现坏死性
D.
疼痛位于胸骨后或心前区
E.
老年人不会出现牙疼、腹痛、腹泻等症状
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