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问题 单项选择题

隧道内（包括按规定降低高度的隧道口外及跨线建筑物范围内）困难情况下接触线距轨面的最低高度不应小于（）mm。

A.5650

B.5700

C.6000

D.6200

答案

参考答案：A

单项选择题

MIDI enables people to use （） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （） ", the Hardware interface and a distribution （） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （） 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.

However, when MIDI Protocol （） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence.

A．messages

B．packets

C．frame

D．information
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单项选择题

法律责任的特征是（）。

A.政治性

B.道义性

C.惩罚性

D.义务性
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