在跳汰选煤过程中,对于相同原料煤,可采取增大用水量的方法来增大()值,从而增大干扰沉降速度。
A、容积浓度
B、松散系数
C、浓度系数
D、松散浓度
参考答案:B
_____, the boy couldn't enter his house.
A.Since the key had lost
B.The key being lost
C.Lost the key
D.Having lost the key
Stations are grouped by countries arranged in the()order of their country symbols.
A.alphabetical
B.figure
C.name of stations
D.series