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问题 单项选择题

OTDR测量范围是指OTDR获取数据取样的最大距离，此参数的选择决定了取样分辨率的大小。最佳测量范围为待测光纤长度（）倍距离之间。

A.1～1.5

B.1.5～2

C.2～3

D.3以上

答案

参考答案：B

选择题

2006年12月1日至15日，第______届亚运会在卡塔尔首都多哈举行。中国体育代表团共获得______枚金牌，连续七次位居金牌榜第一位。[ ]

A．六   19   

B．十四   165

C．十五   165

D．十五   155
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单项选择题

MIDI enables people to use (11) computers and electronic musical instruments. There are actually three components to MIDI, the communications" (12) .", the Hardware Interface and a distribution (13) called "Standard MIDI Files". In the context of the WWW, the most interesting component is the (14) Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol (15) are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

（11）是（）

A.personal

B.electronic

C.multimedia

D.network
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