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【多选题】
( ) 下列哪些说法是对的 ?A.
各种 维生素 人体都不能自身合成。
B.
抗坏血酸既具有酸性又具有还原性。
C.
维生素 B 6 与氨基酸代谢密切相关。
D.
缺乏 VA 会引起夜盲症。
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【单选题】对于采用真空控制的中央门锁装置的车辆,当真空管路出现漏气故障时可能会()
A.
所有门锁执行机构工作不正常
B.
左前门锁执行机构正常不工作
C.
右前门锁执行机构正常不工作
【单选题】If Sam is producing at a point on his production possibilities frontier, then he
A.
cannot produce any more of either good.
B.
is unaffected by costs and technology.
C.
can produce more of both goods.
D.
is not subject to scarcity.
E.
can increase the production of one good only by decreasing the production of the other.
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【简答题】公文标题中除（）要加书名号外，一般不加标点符号。
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