The total berth time for a vessel can be reduced through a reduction().
A. of working gangs
B. of idle time
C. in productivity of the working shifts
D. of working hours each working day
RM80型清筛机的设计最大挖掘深度(自轨面向下)是()mm。
A. 800
B. 1000
C. 1200
D. 1500
钼酸铵分光光度法测定水中总磷时,如试样浑浊有色度,需配制一个空白试样(消解后用水稀释至标线),然后向试样中加入3ml浊度-色度补偿溶液,还需加入抗坏血酸和钼酸盐溶液,然后做吸光度扣除。
A. 正确
B. 错误