用调整水量方法测定时,以试锥下沉深度()时的净浆为标准稠度净浆。
The Master of a cargo or tanker shall be responsible that each lifeboat,except those free-fall launched,is lowered to the water with crew and maneuvered at least once every().
A. week
B. month
C. three months
D. year
一个没关紧的水龙头,在一个月内就能漏掉约()水,同时产生等量的污水排放。如果全国3.9亿户家庭用水时能杜绝这一现象,那么每年可节能340万吨标准煤,相应减排二氧化碳868万吨。
A. 0.2吨
B. 2吨
C. 20吨
D. 200吨