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【单选题】
Which of the following is incorrect ? Evaluation of forecast accuracyA.
is important since the production of forecasts is costly to the firm.
B.
requires the use of symmetric error cost functions.
C.
is important since it may reduce business losses from inaccurate forecasts.
D.
is done by averaging forecast errors
E.
both B and D are incorrect
F.
both A and B are incorrect
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【简答题】大气污染则是指由于人类活动或自然过程,使得某些物质进入大气中,呈现出___,达到了___,并因此危害了___、___和___,甚至危害了___。
【判断题】(Unit 5 Text B) The scammers also take advantage of some natural disasters to make money.
A.
正确
B.
错误
【判断题】大气污染是指由于人类活动或自然过程使得某些物质进入大气中,呈现出足够的浓度,达到了足够的时间,并因此而危害了人体的舒适、健康和人们的福利 ,甚至危害了生态环境,大气污染主要由人类活动引起的。
A.
正确
B.
错误
【单选题】(Unit5 Text B) David was _____ his clothes for the journey tomorrow.
A.
sorting out
B.
sorting for
C.
sorting of
D.
sorting in
【简答题】简述免疫器官的组成及其在免疫中的主要作用
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