单项选择题 1. 下列不是能谱仪缺点的是（ ） A. 分辨率低; B. 能谱仪只能分析原子序数大于11的元素; C. 能谱仪的Si(Li)探头必须保持在低温态，因此必须时时用液氮冷却; D.适于粗糙表面分析.

未知题型 插入的SMART ART图形正确、 美观

单项选择题 Read the following analytical paragraphs, and decide which method is used to develop each paragraph. Fill in the black with A, B, C, D or E. A. classification B. compare and contrast C. process analysis D. cause and effect E. problem and solution 1. Eating in is often regarded as a good method of saving time, energy and money, but this may not necessarily be so. The cost of eating in, in terms of groceries needed for nutritious yet appealing meals, is on the rise; whereas, the cost of an economical, yet balanced meal out-on-the-town has risen very little over the past few years.