按机床面板下方绿色电源键，开动机床。
A、正确
B、错误

A.Ⅰ、Ⅱ
B.Ⅱ、Ⅲ
C.Ⅲ、Ⅳ
D.Ⅰ、Ⅳ

A.肺结核伴空洞
B.支气管扩张
C.肺梗塞
D.肺炎球菌肺炎
E.风湿性心脏瓣膜病

A．Centromeres are sequences located at the ends of each chromosome.
B．Nucleolar organizer regions are portions of chromosomes where ribosomal RNA genes are clustered and transcribed.
C．Telomeres are where sister chromatids adhere to each other and where spindle fibers attach during cell division.
D．Chromosome organization is random in the interphase nucleus.