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【单选题】
法医“马氏试砷法”来检验动物是否砒霜(R)中毒，其化学原理为：R+8HCl+4Zn==4ZnCl 2 +3H 2 O+2As + H 2 ↑，则砒霜的化学式为 [ ]A.
As 2 O 2
B.
As 2 O
C.
AsO
D.
As 2 O 3
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皮皮学刷刷变学霸
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