A.主要由3种核纤层蛋白组成
B.核纤层属于微管,与细胞质中的微管相连
C.附着在内、外核膜上
D.维持核孔位置和核被膜形态
E.为染色质提供核周锚定部位
The secretary had the messenger ______ the envelope as soon as possible.
A.delivering
B.to deliver
C.deliver
D.delivered
A.closet
B.envelope
C.tunnel
D.corner
The ________ stuck on the envelope says “By Air”.
A) diagram
B) label
C) signal
D) mark