Ethernet物理地址长度为______。 A: 6bit B: 18bit C: 48bit D: 56bit

Questions 11 to 18 are based on the conversation you have just heard. A: The weather was a little bit cold. B: The weather was a little bit warm. C: The weather was favorable. D: The weather was disappointing.

Questions 11 to 18 are based on the conversation you have just heard. A: The weather was a little bit hot. B: The weather was a little bit cold. C: The weather was cooler than expected. D: The weather was bad.

Question 11 to 18 are based on the conversation you have just heard. A: The weather was better. B: The weather was a little bit warmer. C: The weather was a little bit colder. D: The weather was cooler than expected.

写出下列的plc基本逻辑指令的含义：LD bit指令（ ）；LDN bit（ ）；A bit（ ）； AN bit（ ）； O bit（ ） ； ON bit（ ） ； = bit（　　　　　　）

常规BIT技术可以分为BIT技术、BIT技术和BIT技术

The transmission rate of the binary digital transmission system is 2400B,then the transmission bit rate is ____;if the system is hexadecimal, with the same symbol rate, the transmission bit rate is ____. A: 2400 bit/s, 2400 bit/s B: 2400 bit/s, 4800 bit/s C: 2400 bit/s, 9600 bit/s D: 4800 bit/s, 9600 bit/s

LDN bit 表示 指令，ON bit 表示 指令，= bit 表示 指令 。

IPv6地址的长度是（) A: A.32 bit B: B.48 bit C: C.64 bit D: D.128 bit

ATM信元的长度是( )。 A: 48 bit B: 53 bit C: 32 bit D: 64 bit