水平巷道和倾斜巷道内用钢丝绳牵引的车辆运送爆炸材料时，运输速_爱下问搜题

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问题单项选择题

水平巷道和倾斜巷道内用钢丝绳牵引的车辆运送爆炸材料时，运输速度不得超过（）m/s。

A.1

B.2

C.3

D.4

答案

参考答案：A

单项选择题

Questions 14-23

·Look at the ten statements for this part.
·You will hear a story about communication through time.
·Decide whether you think each statement is right(R), wrong(W) or not mentioned(NM).
·You will listen to it twice.
·Mark your answers on the Answer Sheet.

Because of the flat tire, Andrew had to sleep in the car all night.

A．Right

B．Wrong

C．Not Mentioned

单项选择题

当PC机的串行口(COM口)采用奇校验一次发送8个数据位时，若从串行口的TxD引脚测到如下图所示的波形：则其起始位、校验位和停止位的序号分别为上图中的

A．(11)、(1)和(2)

B．(1)、(11)和(10)

C．(1)、(10)和(11)

D．(11)、(2)和(1)