They took ________ measures to prevent poisonous gases from escaping.

A．) fruitful B) beneficial

C．) valid D) effective

 

 

[主观题]theauthoritytookappropriatemeasurestosolvethetransportationproblem

[单选题]5． ___________ last week?-I took some photos．A． What did else you doB． What did you doC． What do you doD． What do you did

[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]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]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

[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]（） 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]To prevent the build up of high stresses engine must not be run continuously （）.A . faster than dead slow speedB . slower than dead slow speedC . with the output of MCRD . at critical speed

[单选题]F．ire dampers prevent the fire spreading through the process ofA．convectionB．conductionC．radiationD．direct contact

[试题]The robots are used to prevent human personnel from______(expose)to radiation.