【单选题】
Water can’t be used to put out fires of （）
A、Class A
B、Class B
C、Class C
D、B+C
查看正确答案A、Water foam B、Dry chemical powder C、Water fog D、Alcohol foam
搜题
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第3题
A、is usually cooled by sea water B、can be replaced when worn out C、is in direct contact with the water in the bore of the cylinder D、can t expand when heated
第5题
A、A WHERE clause can be used to restrict both rows and groups. B、A WHERE clause can be used to restrict rows only. C、A HAVING clause can be used to restrict both rows and groups. D、A HAVING clause can be used to restrict groups only. E、A WHERE clause CANNOT be used in a query if the query uses a HAVING clause. F、A HAVING clause CANNOT be used in subqueries.
第6题
A、A WHERE clause can be used to restrict both rows and groups. B、A WHERE clause can be used to restrict rows only. C、A HAVING clause can be used to restrict both rows and groups. D、A HAVING clause can be used to restrict groups only. E、A WHERE clause CANNOT be used in a query of the query uses a HAVING clause. F、A HAVING clause CANNOT be used in subqueries.
第8题
A、overhauling every two year B、working at intervals C、renewing filtration material D、pumping bilge water from different layers respectively
第9题
A、A. A WHERE clause can be used to restrict both rows and groups. B、B. A WHERE clause can be used to restrict rows only. C、C. A HAVING clause can be used to restrict both rows and groups. D、D. A HAVING clause can be used to restrict groups only. E、E. A WHERE clause CANNOT be used in a query of the query uses a HAVING clause. F、F. A HAVING clause CANNOT be used in subqueries.
