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问题 单项选择题

当互见的船舶鸣放“二长一短”笛声表示船舶何种动态？（）

A、本船正在向右转向

B、本船正在向左转向

C、本船请求从前船右舷追越

D、本船请求从前船左舷追越

答案

参考答案：C

单项选择题

一般情况下，（）可分为碳素钢和合金钢.

A.甲类钢

B.钢

C.乙类钢

D.丙类钢
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单项选择题

(1) In the strength of the carrier signal is varied to represent binary 1 or 0.

(2) is a system that can map a name to an address and conversely an address to an name.

(3) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol

(4) is an approach that enables an ATM Switch to behave like a LAN switch.

(5) is an guided media which is made of glass or plastic and transmits signals in the form of light.

5（）

A．Coaxial cable

B．Optical fiber

C．Unshielded Twisted-pair Cable

D．Shielded Twisted-pair Cable
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