When the vessels steering wheel on the navigation bridge is turned, the difference existing between the position of the wheel and that of the rudder is known as （）. ["proportional band","the error signal","the reset signal","feedback"]
对动植物检疫徇私舞弊罪的定性及量刑的说法，下列（）不符合法律规定的。 ["将送检的合格动植物检疫为不合格，或者将不合格动植物检疫为合格是该罪的法定立案标准之一","对明知是不合格的动植物，不检疫而出具合格检疫结果是该罪的法定立案标准之一","构成动植物检疫徇私舞弊罪的，处三年以下有期徒刑或者拘役；造成严重后果的，处三年以上七年以下有期徒刑","动植物检疫徇私舞弊罪的犯罪主体是特殊主体"]
在压裂中，（）的作用在于使油层压力达到破裂压力，将地层压开裂缝。 ["压裂液","携砂液","顶替液","支撑剂"]
管道螺纹接头宜采用（）做密封材料；拧紧螺纹时，不得将密封材料挤入管内。 ["聚四氟乙烯带","密封胶","生料带","螺纹胶带"]
Which of the listed statements is correct concerning refrigeration systems?（） ["Dehydrators must be used continuously in a refrigeration system","A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours","A thermostatic expansion valve is used to control refrigerated space temperature","The liquid receiver functions to collect and remove non- condensable gase"]
中餐上菜的顺序是什么？
