20减去3.1的差的6倍,再除以0.7,商是多少?正确的列式是[ ]
A. 20-3.1×6×0.7
B. (20-31) ×6÷0.7
C. (20-3.1×6)÷0.7
答案:B
The meeting will begin in 10 minutes, ________we can sing a few songs
A.though
B.however
C.meanwhile
D.besides
离合器调整的目的是()。