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not/but neitheror either/or not only/but also
passing it through the expansion valve condensing refrigerant in the system condenser passing the gaseous refrigerant through the heat interchanger on the suction sideof the compressor maintaining a high pressure on the systems receiver
internal heat it can withstand load it can carry continuously load it is capable of supplying overload it can carry for a specified time only
deadly. painful. helpful. stressful.
finding so as to find found only to find
Heat is given off from a high temperature region known as a heat sink Heat transfer rate is affected most by the size of the heat sink involved Heat transfer rate is affected most by the temperature difference between the heatsource and the heat sink Heat transfer by radiation will occur only by mass motion of a fluid substance
space limitations prevent separately run pipes the engines are small auxiliary units they are arranged to prevent gas backflow to each engine a waste heat boiler is installed
Natural convection only Forced convection only Both natural convection and forced convection None
an oil seal removing heat a gas seal cooling the piston
（1） only is correct （2） only is correct both （1） and （2） are correct neither （1） or （2） are correct
“ 仅 限 货 机 ” (Cargo Aircraft Only) “ 向 上 ” (PackageOrientation )、 “磁性物质 ”(Magnetized Material) 标签、 “远离热源”(Keep Awayfrom heat) 标签
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