皮皮学，免费搜题
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【判断题】
1 H NMR 谱中各峰面积的比例用曲线高度表示,称为谱线裂分。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Jenny Edward divulged her intention of trying vaccination under a bond of secrecy because she feared ridicule if they______.
A.
have failed
B.
should fail
C.
failed
D.
being failed
【简答题】vaccination
【单选题】Take your vaccination certificate with you ______ they ask for it at the airport.
A.
unless
B.
in case
C.
when
D.
because of
【单选题】Vaccination is important in the______.
A.
fight against heart disease
B.
prevention of diseases
C.
discovery of bacteria
【简答题】vaccination certificate _____
【简答题】vaccination
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