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问题 单项选择题

热带口炎性腹泻患者的口角炎、唇炎、舌炎，是由于（）。

A.缺乏维生素B

B.低蛋白血症

C.缺乏维生素A

D.维生素D

E.缺乏维生素E

答案

参考答案：A

单项选择题

咬入角就是轧制时轧件与轧辊表面所接触的弧线对应的（）。

A．圆周角

B．圆心角

C．圆弧角
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单项选择题

MIDI enables people to use (61) computers and electronic musical instruments. There are actually three components to M1DI, the communications " (62) ", the Hardware Interface and a distribution (63) called "Standard MIDI Files". In the context of the WWW, the most interesting component is the (64) Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol (65) are stored in MID! 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.

A．device

B．protocol

C．network

D．controller
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