工艺标准库中要求,屋面蓄水应高出屋面最高点()cm,静置时间不小于()h。
A、2,24;
B、3,21;
C、1.5,24;
D、2,22。
参考答案:A
Kristen Chandler, CFA, has been doing research about different types of goods. Which of the following goods has a positively sloped demand curve as a result of the negative income effect overweighting the positive substitution effect()
A. Veblen.
B. Giffen.
C. Inferior.
“三同时”是指劳动保护设施与主体工程同时设计、同时施工、()。
A.同时投产
B.同时结算
C.同时检修