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问题 单项选择题

螺旋桨的桨叶角增大叫（），发动机启动时螺旋桨在（）。

A.变大距，低桨叶角

B.变小距，低桨叶角

C.变桨距，高桨叶角

D.变几何桨距，高桨叶角

答案

参考答案：A

单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.

(71) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.

(72) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

(73) functions with two layers of protocols. It Can connect networks of different speeds and can be adapted to an environment as it expands.

(74) is the popular LAN developed under the direction of the IEEE 802.5.

(75) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

73（）

A．The hub

B．The bridge

C．The router

D．The proxy
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单项选择题

事故信号是表示（）。

A、开关事故跳闸；

B、设备异常告警；

C、开关手动跳闸；
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