单项选择题 对于一个链串s，查找第i个元素的算法的时间复杂度为（     ）。 A. O(1) B. O(n) C. O(n^2) D. 以上都不对

单项选择题 Perth operates a process costing system. The process is expected to lose 25% of input and this can be sold for 52,500 .Direct labour, $9,625 for the period. There is no opening or closing work in progress in the period. Actual output was 2,800 kg. What is the valuation of the output?

问答题 热电偶电动势由温差电势和           两部分组成。