质粒载体是在天然质粒的基础上为适应实验室操作而进行构建的,构建方法为()。
A.人工构建
B.天然合成
C.化学提取
D.生物合成
E.以上都是
参考答案:A
Which of the following is NOT part of the basic inventory equation()
A. Beginning inventory + purchases = ending inventory + cost of goods sold.
B. Purchases - ending inventory + beginning inventory = cost of goods sold.
C. Beginning inventory - ending inventory - cost of goods sold = purchases.