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【单选题】
在 T-SQL 语法中,用来插入和更新数据的命令是A.
INSERT ， UPDATE
B.
UPDATE,INSERT
C.
DELETE ， UPDATE
D.
CREATE ， INSERT INTO
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【简答题】连续型火警探测器按感温环线的构成和原理分为()感温环线、()感温环线和()感温环线。
【单选题】RBC Corporation currently has a negative contribution margin. Which of the following statements is true?
A.
It can break even by increasing its sales volume.
B.
It can achieve a positive operating profit by reducing its fixed costs.
C.
It can improve profits by decreasing its variable cost per unit.
D.
It can improve profits by decreasing its selling price.