李师傅每小时加工零件84个,张师傅4小时加工零件312个.李师傅比张师傅每小时多加工零件几个?
84-312÷4
=84-78
=6(个)
答:李师傅比张师傅每小时多加工零件6个.
判断呼吸衰竭的指标是指安静状态下呼吸空气时PaO测定值小于()
A.20mmHg
B.30mmHg
C.40mmHg
D.50mmHg
E.60mmHg
Lucy thinks that ____ English movies isn't a good way. [ ]
A. watch
B. watched
C. watching
D. to watching