题目内容

相位法测量中两个相互垂直的简谐振动的频率相等。

A. 对
B. 错

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The earliest Internet was

ARPAnet
B. MILnet
C. NSFnet
D. ANSnet

According to the size of the network，the network can be divided into

A. WAN CAN LAN
B. WAN MAN LAN
C. WAN MAN TAN
D. GAN MAN LAN

The network can be split into two parts according to the working mechanism：

The basic types of topologies are ：