有焰燃烧时要求空气过剩系数（）。A.n＝1.15～1.25 B.n＝1.05～1.1_爱下问搜题

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问题单项选择题

有焰燃烧时要求空气过剩系数（）。

A.n＝1.15～1.25

B.n＝1.05～1.10

C.n＝1.3～1.4

答案

参考答案：A

完形填空

完形填空（共20小题，每题1．5分，共30分）
A White – bearded ancient man was walking over the hills and valleys of the world．On his back he carried a bag which moved uneasily as if something was trying to escape from it, but he   21  it between his shoulders and walked on．
He was Father Time, traveling forever, and the bag he   22  was filled with Tomorrows, all struggling to get out．
Each   23  at twelve o’clock, he opened the bag and   24  a Tomorrow, just one, with its wings of   25  , and its shining feathers rose with hope．All the rest were kept   26  by Time’s strong hands and pushed   27  in the bag．
Down flew the Tomorrow   28  its lovely feathers, but as it touched the   29  , off fell its blue wings and it changed to a（n）  30  white bird which could not fly．It had become a Today．Everyone knows that Today isn’t as   31  as Tomorrow, for Today can be held in one’s   32  , accepted, unloved, but Tomorrow is full of mystery（神秘）and beauty．It is   33  by all the world．Even those with   34  hope sigh, “Tomorrow may bring a（n）  35 ．Tomorrow’s life will be different．”
Everybody tried to   36 the Tomorrow before it fell to the ground．They thought if they   37  beforehand what the Tomorrow carries, they could   38  for it．So they put great nets on the trees, seeking to catch one   39  it changed his feather．Yet although they tried every means, the birds   40   and flew to the ground as Todays．

单项选择题

女性，23岁。体检时发现血压高达200／110mmHg，无自觉症状。临床考虑为肾血管性高血压，下列哪项对诊断有利（）

A.有高血压遗传史

B.眼底检查有动静脉交叉受压

C.肾动脉造影

D.肌酐1.5mg/dl

E.肾区有血管杂音