锅炉检验分为运行时的外部检验、（）停炉时的内外部检验和每三年一次的水压试验三种。
A、长期
B、短期
C、定期
D、不定期
参考答案：C
Last year’s receipts from the sale of greeting cards during the week before Mother’s Day totaled $189 million, which represented 9 percent of total greeting card sales for the year. Total greeting card sales for the year totaled how many million dollars ？（）
A. 17,010
B. 2,100
C. 1,890
D. 1,701
E. 210
董事会临时指派的项目必须立项。
