After fitting back in place the gear w

1、The（） is fitted in pair one is the mai

The（） is fitted in pair one is the main valve, the other the auxiliary or standby.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve

2、（）are used for anchor gear in marine w

（）are used for anchor gear in marine work where the chains must withstand the corrosive effects of seawater.AChainsBWiresCRopesDLine

3、The defective place in the furnace sho

The defective place in the furnace should be （） with fire bricks.ApavedBcleanedCweldedDdismantled

4、The（）is fitted in the main steam suppl

The（）is fitted in the main steam supply line and is usually of the non-return type.Amain steam stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve

5、A cast steel strong back is fitted in

A cast steel strong back is fitted in way of the combustion space to help absorb （）.Aflame temperatureBfuel oilCair movementDgas force

6、（）is the place to store the goods in p

（）is the place to store the goods in ported or in transit without paying duty under custom’s supervision .A Boned warehouseB Exported warehouseC Imported warehouseD customer warehouse