为预防CO中毒,车间空气中CO的最高浓度是()
A.10mg/m3
B.20mg/m3
C.30mg/m3
D.40mg/m3
E.50mg/m3
参考答案:C
The long service of decades of the to-be-retired with the company was ______ a present each from the President.
A.confirmed by
B.recorded in
C.acknowledged with
D.appreciated for
有关查询设计器,正确的描述是
A.“联接”选项卡与SQL语句的GROUP BY短语对应
B.“筛选”选项卡与SQL语句的HAVING短语对应
C.“排序依据”选项卡与SQL语句的ORDER BY短语对应
D.“分组依据”选项卡与SQL语句的JOIN ON短语对应