若100a=5,10b=2,则2a+b=[ ]
A.0
B.1
C.2
D.3
答案:B
─How long will you stay here?
─I think I will be here for _____ more days. [ ]
A. few
B. a few
C. little
D. a little
机床液压油箱应保持合适的温度,一般油温不能超过60℃,液压机械一般应在()范围内工作比较合适。
A.35-60°C
B.60-70°C
C.25-40°C
D.70-80°C