An orifice-check valve placed in a hydraulic system is used to（）
1、Fuses placed in series with a thermal
Fuses placed in series with a thermal trip-type circuit breaker are used for （）.Atime-delay protectionBshort-circuit protectionCshort duration surge protectionDsustained overload protectio
2、When placed in a magnetic field, which
When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）AGlassBBakeliteCSoft ironDAluminum
3、In an engine with air inlet valve and
In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exh...
4、Placing a filter on the （） of an oily
Placing a filter on the （） of an oily water separator will "polish" the discharge but overloading must be avoided.Asuction sideBdischarge sideCby-pass pipeDsampling pipe
5、The intake valves in a diesel engine a
The intake valves in a diesel engine are reseated by （）.Acam followersBpush rodsCcombustion gasesDvalve spring
6、A patient in shock should NOT be place
A patient in shock should NOT be placed in which position? （）AOn their side if unconsciousBHead down and feet up，no injuries to face or headCFlat on their back with head and feet at the same levelDArms above their head