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问题 单项选择题

40岁，经产妇，继发性痛经1年余，逐渐加重。查体：子宫后倾，球形增大，质硬，附件未见异常，诊断最可能是（）

A.妊娠子宫

B.子宫肌炎

C.子宫腺肌病

D.畸形子宫

E.子宫肌瘤

答案

参考答案：C

单项选择题

采用切削叶轮调节时，对于中、高比转数水泵，根据第二切削定律，调节后功率与原功率的比为切削比的（）。

A．一次方

B．二次方

C．三次方

D．不变化
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单项选择题

MIDI enables people to use （66） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （67） ", the Hardware interface and a distribution （68） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （69） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （70） 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.

67（）

A．device

B．protocol

C．network

D．controller
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