纤维囊性乳腺病的特点是()。
A.乳腺小叶增生
B.间质纤维组织增生
C.大汗腺化生
D.导管囊性扩张
E.乳腺小叶导管和腺泡上皮细胞增生
参考答案:A, B, C, D, E
––– Terribly sorry but I thought this was a parking lot.
––– _______. Here is your ticket.
A.That's all right.
B.Never mind.
C.Don’t mention it.
D.Sorry, that is no excuse.
某家庭装修时买了1000块瓷砖,每10块一盒,现在要抽50块检查其质量。若随机按盒抽取全数检查,则属于( )的方法。
A.单纯随机抽样
B.分层抽样
C.机械随机抽样
D.整群抽样