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问题 单项选择题

为了提高诊断或筛检试验的灵敏度，对几个独立试验可：（）。

A、串联使用

B、并联使用

C、先串联后并联使用

D、要求每个试验的假阳性率低

E、要求每个试验的特异度低

答案

参考答案：B

填空题

某同学离平面镜2m，像和他之间的距离是______，当他向镜面走近2m时，那么像相对镜面走近______m，这时镜中的像的大小将______，而他看到的像是______的．
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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.

（12）是（）

A.device

B.protocol

C.network

D.controller
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