Steel brush
Fine emery cloth or steel wool
A section of the removed compression ring
A case hardened scraper
第1题：
Which of the listed devices may be used as a digital device?
A.variable resistor
B.diode
C.strain gauge
D.thermistor
第2题：
Which of the listed devices is used to measure pressure and convert it to an electrical signal?
A.Transducer
B.Reducer
C.Transformer
D.Rectifier
第3题：
Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?
A.Control the amount of lube oil burned in the combustion chamber
B.Transmit heat from the piston to the cylinder liner
C.Prevent damage to ring groove inserts by acting as a heat dam
D.Dissipate combustion chamber gas pressure by channeling it through the ring gap
第4题：
Which of the following interfaces is used to connect analog devices to the Internet?（）
第5题：
Which of the following devices is used to connect a WAN to a LAN?（）
第6题：
A.Switch
B.Hub
C.Modem
D.Repeater
第7题：
Which of the following devices is used to connect multiple devices to a network and does not stopbroadcast traffic?（）
第8题：
Which of the units listed is used to combust waste in the engine room?
A.Boiler
B.Incinerator
C.Generator
第9题：
Which of the following devices could be configured as a DHCP server?（）
第10题：
Which statement is true regarding an Ethernet collision domain?（）