[单选] You just issued the following statement: ALTER TABLE SALES DROP COLUMN PROFIT. Which of the following choices identifies when the column will actually be removed from Oracle?（）

A . Immediately following statement execution
B . After the ALTER TABLE DROP UNUSED COLUMNS command is issued
C . After the ALTER TABLE SET UNUSED COLUMN command is issued
D . After the ALTER TABLE MODIFY command is issued

下列Excel单元格地址表示正确的是（）。 22E。 2E2。 E22。 AE。瓦斯隧道施工供电系统的“三专”是（）。专用变压器。专用开关。专用供电线路。专门的管理人员。专门的监控设备。从发音部位看是双唇音，从发音方法看是鼻音的声母是（）。汽车行驶阻力有：加速阻力、（）、（）、（）。谢列哪种疾病患者需要较高的病室空气湿度：（）心力衰竭。支气管哮喘。 COPD行气管切开。急性肺水肿。肾功能衰竭。 You just issued the following statement: ALTER TABLE SALES DROP COLUMN PROFIT. Which of the following choices identifies when the column will actually be removed from Oracle?（）

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[单选] You just issued the following statement: ALTER TABLE SALES DROP COLUMN PROFIT. Which of the following choices identifies when the column will actually be removed from Oracle?（）

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