To prevent excessive __ in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible

A．thermal stresses

B．bending moments

C．thermal loads

D．surface tensions

[单选题]To prevent excessive __ in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possibleA．thermal stressesB．bending momentsC．thermal loadsD．surface tensions

[单选题]Excessive vibration of an automatically fired auxiliary boiler can be caused by （）A . air or water in the furnaceB . combustion pulsesC . fuel oil pump failureD . flame failure

[单选题]Excessive alkalinity of the water in an auxiliary boiler can cause （）.A . caustic embrittlement of the boiler metalB . acidic corrosion of the boiler metalC . hard scale deposits on the boiler tubesD . etching of the heat exchange surface

[单选题]Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.A . loss of flow in the fuel systemB . loss of pressure in the air systemC . loss of flow in the lubricating systemD . loss of

[单选题]Flow control is a function that prevents network congestion by ensuring that (71) do not overwhelm (72) with datA．There are three commonly used methods for handling network congestion ． (73) is used by network devices to temporarily store bursts of e

[试题]Theytook________measurestopreventpoisonousgasesfromescaping.A．)fruitfulB)beneficialC．)validD)effective

[单选题]（） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.A . An automaticB . A transmissionC . A self-regulatingD . An interlocking

[单选题]The ability of the governor to prevent fluctuations in engine speed is termed （）.A . sensitivityB . stabilityC . promptnessD . speed droo

[单选题]E．xcessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur when the compressorA．has run continuously for a long periodB．suction pressure is below normalC．oil level is below normalD．starts after a long idle period

[单选题]In a diesel engine, excessive cylinder liner wear will cause （）(1) increased blow-by(2) wear between the piston ring and grooveA . (1) only is correctB . (2) only is correctC . both (1) and (2) are correctD . neither (1) or (2) axe correct