[单选] Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）

A . The FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.
B . The FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.
C . The FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.
D . The FXS interface connects directly to ISDN voice channels.

一国某年末外债余额50亿美元，当年偿还外债本息额15已美元，国内生产总值400亿美元，商品劳务出口收入55亿美元，则债务率为（）。 12.5%。 13.8%。 27.2%。 90.9%。何为加工硬化？列出产生加工硬化的各种可能机制。（不必说明），加工硬化现象在工业上有哪些作用？离开了间接经验，人的直接经验会变得非常狭窄。 Which two are characteristics of an IPv6 multicast address？（） First （most significant ） octet is FF in hex。 Starts with a prefix of FE80 to FEBF in hex。 Starts with a prefix of FECO to FEFF in hex。 Second octet contains a 4-bit multicast scope field。 Last 64 bit contains the modified MAC address of the Ethernet interface。 Is allocated from the unicast address space。民族社会化 Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）

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[单选] Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）

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