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【单选题】
关于细胞核的叙述正确的是（）A.
核被膜指包被细胞核的双层膜
B.
不同的细胞内，核仁的大小和数量都是一定的
C.
真核细胞的核被膜上有核孔，脱氧核糖核酸等大分子物质可以通过核孔进入细胞质
D.
原核细胞的拟核除没有核被膜外，其它方面与真核细胞没有差别
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举一反三
【单选题】Which of the following statements is tree, according to the author of this passage?
A.
Certification is very common so you need to get certified, too.
B.
Certification is needed in a wide variety of fields, so may be in yours.
C.
Certification is varied because of more emerging careers and areas.
D.
Certification is becoming more and more important for every one.
【简答题】由于应用的不同,传感接节点也会执行不同的功能,节点与链路的异构会在计算、通信与能量上出现差异。因此,节点与链路的( )问题在设计路由协议时需要认真考虑。
【单选题】The Owners guarantee that the Vessel to be at all times _______ valid and up-to-date certificates to comply with such regulations in every respect．
A.
in stead of
B.
in lieu of
C.
in possession of
D.
in place of
【单选题】汉译英：“产地证书、兽医证书、熏蒸证书”。( )
A.
Certificate of Origin Veterinary Certi6cate Fumigation Certificate
B.
Certificate if Origin Certificate of Health Disinfection Certificate
C.
Certificate of Origin Sanitary Certificate Fumigation Certificate
D.
Certificate of Origin Veterinary Health Certificate Fumigation Certificate
【单选题】What is NOT required on an uninspected towing vessel?
A.
Certificate of Documentation
B.
Certificate of Inspection
C.
Operators Merchant Marine license
D.
FCC Station License
【单选题】A gas-free certificate would usually be issued by a(n) ______.
A.
CCS marine surveyor
B.
certified marine chemist
C.
port engineer
D.
MSA marine inspector
【单选题】______ should be presented to the Customs officers．
A.
Bonded Store List
B.
Deratization Certificate
C.
Load line Certificate
D.
Radio Safety Certificate
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