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【单选题】
恶性肿瘤生长到多大需要血管供给才能生长A.
0.5mm
B.
1.0mm
C.
1.5mm
D.
2.0mm
E.
2mm以上
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【简答题】阅读理解。 Harry keeps a diary. He writes in it every day. Here is his diary for a week in May. Monday 15th It rained all day so we did not have PE class. We stayed in our classroom and read our books. Tue...
【简答题】Hi! My nameis Li Weikang. I’m four years old. I’m 16 Class 4, Grade 7. Today I’d like 17 you something about our classroom. We 18 a big and bright( 明亮的 )classroom. There are twenty-four boysand tw...
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【简答题】What are the problems mainly solved by the physical layer? (物理层主要解决什么问题?) What are the main features of the physical layer? (物理层的主要特点是什么?)
【单选题】Which two correctly describe steps in the OSI data encapsulation process? (Choose two.)
A.
个正确描述了OSI模型数据封装过程中的步骤？（选择两项）
B.
The transport layer divides a data stream into segments and may add reliability and flow control information.
C.
层将数据流划分为段，并且可以添加可靠性和流控制信息。
D.
The data link layer adds physical source and destination addresses and an FCS to the segment.
E.
链路层将物理源和目标地址以及FCS添加到段。
F.
Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information.
G.
层用源和目标主机地址以及与协议相关的控制信息封装成帧时，数据包被创建。
H.
Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
I.
络层将第3层地址和控制信息添加到段时，将创建数据包。
J.
The presentation layer translates bits into voltages for transmission across the physical link. K. 层将比特转换为电压以便通过物理链路传输。
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