下面图的杠杆中，哪一个是费力杠杆？ [ ]
A.
B.
C.
D.
答案：C
现行版《中国药典》规定，胶剂水分限度为（）
A.10%
B.12%
C.15%
D.8%
E.18%
Before hydraulic starting of an engine on a covered lifeboat，what need NOT be checked?（）
A.Fuel supply line valve
B.Pressure registered on the accumulator gauge
C.Cold-spark voltage readings test lamp
D.Engine stop control
