师徒二人每小时加工零件的比是8:5,已知徒弟每小时比师傅少加工12个,徒弟每小时加工零件多少个?
12÷(85-1)
=12÷35,
=20(个).
答:徒弟每小时加工20个.
Jack felt nervous when he found the physics problems ____ to work out.
A.easy enough
B.too easy
C.too difficult
D.difficult enough
何谓客运记录?