牛乳中黄曲霉毒素M1的标准是()。
A、小于0.5ppb
B、小于0.3ppb
C、小于5ppb
D、小于0.25ppb
参考答案:A
Is this room ________ the meeting?
A.large enough to have
B.enough large to have
C.large enough having
D.enough large having
火场逃生的原则是()
A.抢救国家财产为上
B.安全脱离,救助结合
C.先戴上以后生活必需品、钱财要紧
D.逃命要紧