在用设备完好率是指（）之比的百分数。A、在用设备完好台数与在_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

在用设备完好率是指（）之比的百分数。

A、在用设备完好台数与在用设备总台数

B、在用设备完好台数与所有设备总台数

C、所有设备完好台数与所有设备总台数

D、所有设备完好台数与在用设备总台数

答案

参考答案：A

单项选择题

导致阑尾穿孔最主要的因素是

A．阑尾腔阻塞

B．阑尾壁受粪石压迫缺血

C．细菌毒力

D．淋巴管阻塞

E．免疫力低

填空题

阅读下面短文，请根据上下文意思及方框中所给单词、短语的适当形式填空。

order take run into flow over continue

     The American explorer, R.E Bird, became the first man to fly over the South Pole in 1929. He    1
a lot of photographs during the flight but then he    2   difficulties. His plane could not get over the
mountains so he    3   his men to throw out heavy food sacks. The plane then    4   the mountains and
   5   without further trouble.