当脑内苯丙氨酸增多时,可抑制()酶活性,致使酪氨酸生成()的代谢途径受阻。
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A fuse that blows often should be replaced only with a fuse of ().
A. the recommended current and voltage rating
B. higher current and voltage rating
C. higher current and lower voltage rating
D. lower current and higher voltage rating
()的价值争论分为两派,即强调公民参与的民主理论和限制公民参与的民主理论。
哺乳动物出现抽搐,可能是由于血液中锌盐的含量太低吗?