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【单选题】
能生成儿茶酚胺类激素的氨基酸是A.
丙氨酸
B.
苯丙氨酸
C.
酪 氨酸
D.
蛋氨酸
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A.
5
B.
6
C.
7
D.
8
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A.
interference
B.
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C.
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D.
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A.
not until I failed;I realized
B.
until I failed; I didn’t realize
C.
not until I failed; did I realize
D.
until I failed; I realized
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