陶瓷容器中可能移入食品的有害金属是
A.铅、镉
B.铁、锌
C.铜、钴
D.钼、镍
E.铬、锡
参考答案:A
通过公开招标方式所确定的价格恰好是供求决定的市场价格。( )
Tonnage openings must be closed by means of().
A.Press board
B.Steel hatch boards
C.Steel plates
D.Wooden hatch boards