题目：
META Ltd.Vacuum Cleaner Manufacturer | |
| DATE COMPANY STARTED | In the year (16) |
| COMPANY’S MARKET POSITION BASED ON | (17) |
| PLANS TO INVEST IN | A new (18) to improve customer service |
| REWARDS EMPLOYEES WITH | (19) when large orders are finished on time |
| TRAINING PROGRAM HAS RECEIVED | (20) from local government |
| PROMOTES STAFF WITH GOOD | (21) towards the company |
| BUSINESS SECTION NEEDING IMPROVEMENT | (22) |
META Ltd.Vacuum Cleaner Manufacturer | |
| DATE COMPANY STARTED | In the year (16) |
| COMPANY’S MARKET POSITION BASED ON | (17) |
| PLANS TO INVEST IN | A new (18) to improve customer service |
| REWARDS EMPLOYEES WITH | (19) when large orders are finished on time |
| TRAINING PROGRAM HAS RECEIVED | (20) from local government |
| PROMOTES STAFF WITH GOOD | (21) towards the company |
| BUSINESS SECTION NEEDING IMPROVEMENT | (22) |
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B解析： 在选课表中，每个学生只要选修了一门课程就有一条记录，如果选修了多门课程，就有多条记录。特殊函数COUNT(*)用来统计记录的个数，不消除重复行，不允许使用DISTINCT短语。选项A统计的是选课...
