The function of the cut-off lever is（）

A . alerting B . on-scene communication C . safety information D . general communicatio

A . the information B . the formation C . the scatter D . the frictio

A . Packet switching B . Collision prevention on a LAN segment. C . Packet filtering D . Broadcast domain enlargement E . Broadcast forwarding F . Internetwork communicatio

A . reduce the rolling of the vessel B . serve as the vessel's main strength member C . add strength to the bilge D . protect the vessel's hull when alongside a dock

A . directly increase the pressure of the liquid being pumped B . directly increase the velocity of the liquid being pumped C . convert the potential energy of the liquid to kinetic energy D . separate air from the liquid being pumped

A . Protects against suction valve float B . Provides a positive pressure on the air inlet valves C . Prevents lubricating oil contamination of the compressed air supply D . Protects against the damaging effects of airborne solid particle

A . refreshing the air B . making person upset C . adjusting the air humidity D . adjusting the air temperature

A . Evidence of the contract B . A receipt for the goods C . A document of title D . Evidence of the ship being seaworthine

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 ga

A . Prevents lateral movement of the slow speed gear B . Transmits propeller thrust to the hull C . Keeps spring bearings in line D . Prevents main reduction gear axial movement

A . manages the CRS Server   B . creates CRS Engine reports   C . creates application scripts for call flows   D . remotely manages the LDAP Directory &e

A . To direct the operation B . To help the market development, operation and management C . To guide the mobile equipment, like truck and ship D . To speed up the process

A．To stop hackers from stealing your personal information. B．To disconnect your PC from the Internet when it is being attacked. C．To keep hidden software in your computers from leaking valuable information. D．To block hostile cookies and bugs from being planted on your computers.

A．A.headstock B．B.carriage C．C.tailstock D．D.chunk

A．For humor as well as reaffirming the difficulty with dressing for a big date. B．For indicating the author's embarrassment about how to dress. C．For opposing to so many dates among boys and girls. D．For disagreeing to the complexity of human dressing. 此题为多项选择题。

A. reduce friction B. carry away contaminants and debris C. prevent corrosion and seal for gases D. all of the above