由涉水产品带入饮用水中的有害物质无依据可确定容许限值时,需进行()
A.流行病学调查
B.毒理学试验
C.浸泡试验
D.致畸试验
E.致癌试验
参考答案:B
由2-a>0,得a>2;______.
_______ Lucy _______ Lily can go dancing with you, because they are not allowed to go out on school nights.
A.Either; or
B.Neither; nor
C.Both; and
D.Not only; but also