初乳
A.产后4天内的乳汁称为B.产后5天~10天的乳汁称为C.产后11天~9个月的乳汁称为D.产后3个月~6个月的乳汁称为E.产后10个月以后的乳汁称为
参考答案:A
—Must I hand in my exercise book now, Mr. Zhao?
—No, you _______. You may give it to me tomorrow. [ ]
A. needn't
B. mustn't
C. can't
机壳及外露金属表面均应进行防腐处理,涂漆可以与原出厂颜色不一致()