第16题: [单项选择]氧化微库伦法适合于测定总硫含量在()mg/m3的天然气。 A. 0~500 B. 1~1000 C. 1~2000 D. 500~1000 参考答案:B
第17题:[简答题]<br><br><br/>参考答案:一个解决的办法似乎是每次换班持续的时间长一些,可以一个月甚至三个月倒一次班。 答案解析:解析:这是一个简单句。on shift意为“倒班,轮班”;seem to be意为“似乎是”。
第18题:[单选题] The time and effort he has devoted during the past few years _____ trees in that remote area is now considered to be of great value. A. to planting B. to plant C. plant D. planting 参考答案:A 句意:人们认为他在过去的几年里在那个偏远的地区为植树所花的时间和付出的努力是非常有价值的。题干中he has devoted during the past few years in that remote area为定语从句,先行词是the time and effort,将先行词代入定语从句后为:He has devoted the time and effort to planting trees in that remote area during the past few year…故选A。