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教育现象指人类各种教育活动的外在表现形式。( )

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● 某循环队列的容量为 M，队头指针指向队头元素，队尾指针指向队尾元素之后，如下图所示（M=8），则队列中的元素数目为（41）（MOD表示整除取余运算）。
（41）

A. rear – front
B. front – rear
C. (rear –front + M) MOD M
D. (front – rear + M) MOD M

教育学的发展历程共有几个阶段？请举出主要代表人物及代表著作。

● Traditional Internet access methods like dial-up were so slow that host computers were connected to the dial-up （71） at the customer premise over slow （72） ports. PPP was designed to run directly over these serial links. But with the advent of broadband Internet （73） technologies such as ADSL and cable modems there has been a considerable increase in the bandwidth delivered to the end users. This means that the host computers at the customer premise connect to the （74） or cable "modem" over a much faster medium such as Ethernet. It also means that multiple （75） can connect to the Internet through the same connection.

● 以下控制流程图的环路复杂性V(G)等于（54）。
（54） A．4 B．5 C．6 D．1