As we all know the H1N1 Flu is so serious, students can’t go into the school _______ they take the temperature and get sure they don’t have a fever.
A.
till
B.
after
C.
when
D.
until
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举一反三
【单选题】What are three characteristics of the TCP protocol? (Choose three.)
A.
P协议的三个特征是什么?(选择三项)
B.
It uses a single SYN-ACK message to establish a connection.
C.
P协议使用单个SYN-ACK消息建立连接。
D.
The connection is established before data is transmitted.
E.
输数据之前建立连接。
F.
It ensures that all data is transmitted and received by the remote device.
G.
P协议确保远程设备发送和接收所有数据
H.
It supports significantly higher transmission speeds than UDP.
I.
P协议支持比UDP协议更高的传输速度。
J.
It requires applications to determine when data packets must be retransmitted. K. P协议需要应用程序确定何时必须重新传输数据包。 L. It uses separate SYN and ACK messages to establish a connection.