色斑皮肤者应食用()。
A.必须氨基酸
B.植物纤维素
C.抗氧化营养素
D.微量元素
参考答案:C
A new coil of nylon line should be opened by().
A.pulling the end up through the eye of the coil
B.taking a strain on both ends
C.uncoiling from the outside with the coil standing on end
D.unreeling from a spool
国内铁路货运单证有铁路货物运输订单、()、铁路货票。
A.货物运单
B.领货凭证
C.货签
D.货物交接单