A heater in the circuit facilitates warning of the engine prior to （） by circulating hot water.

[单选题]An electric heater built into some smaller diesel engines is used to （）.A . raise lube oil viscosity for easier starting in cold weatherB . increase air inlet temperatureC . increase compression ratioD . increase jacket water temperature for easier s

[试题]C．ircuit Switching is problematic because data communications is（），that is， it is typically dominated by short bursts of activity with long periods of（）.A．reliable B．bursty C．digital D．continuous A．latency B．transmission C．delay D．inactivity

[名词解释] SELV回路（SELV circuit）

[名词解释] PELV回路（PELV circuit）

[单选题]Why is it necessary to warn engine room personnel before activating the fixed CO2 system?A．To make them aware there is a fireB．To let them know they should leave the engine roomC．To prevent possible injury from frostbiteD．To make them aware that vent

[名词解释] VC（Virtual Circuit）虚电路

[单选题]Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.A . connection orientedB . connectionles

[单选题]Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the(66)preceding input values and the preceding internal s

[名词解释] 一回路 primary circuit

[名词解释] PVC（Permanent Virtual Circuit）永久虚电路