（） are mounted in pairs to protect the

1、（） are used to limit the pressure in a

（） are used to limit the pressure in any particular portion and mainly control the pressure after the valve.ARelief valvesBCheck valvesCSafety valvesDReducing valve

2、To protect the netwo

To protect the network from external and internal threats， where should Cisco IPS be&#...

3、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

4、In a hydraulic system, （） are used to

In a hydraulic system, （） are used to protect the system from over pressure.Astop valvesBcheck valvesCsafety valvesDreducing valve

5、Stretchers are fitted in lifeboats to

Stretchers are fitted in lifeboats to provide a（）.Aplace for people to lie downBmeans for rigging the sailCplace for rowers to brace their feetDsuitable means for water to drain below the footing

6、2． —1 want to buy the book "Cold Mount

2． —1 want to buy the book "Cold Mountain"． Do you know its _________?—Not really． Maybe three dollars．A coverB sizeC colorD price