【单选题】工程造价咨询企业资质等级分为______。
【单选题】Return sample can also be called ( ).
【简答题】A.The survey received a low rate of return. B.The sample selected was not representative. C.The questionnaires were too difficult. D.The results of the survey were against the public opinion.
【多选题】Sale by sample can be classified into categories including ( ).
A.
sale by seller's sample
B.
sale by buyer's sample
C.
sale by counter sample
D.
sale by reference sample
【判断题】工程造价咨询企业资质等级分为甲级、乙级和丙级。
【判断题】相干解调要求本地载波与发送载波同频,但不要求同相。