为防止机械呼吸阀盘锈蚀或卡住而影响储罐的常同时在罐上装一液压安全阀，其工作压力比机械呼吸阀（）
A.高10%
B.低10%
C.相等
参考答案：A
An analyst does research about the difference between International Financial Reporting Standards (IFRS) and U. S. Generally Accepted Accounting Principles (GAAP). In contrast to U. S. GAAP, which of the following is NOT permitted under IFRS（）
A. Amortization of goodwill.
B. Use of the revaluation model.
C. Using the last-in, first-out (LIFO) method.
简述多糖的合成过程。
