1、当发动机冒烟、工作不正常,进气、排气有问题时,在没有探明原因前,()起动发动机。
A、可以
B、不可以
C、视情况而定
参考答案:B
Mrs. Taylor has 8-year-old daughter who has gift for painting – she has won two national prizes .
A.a ; a
B.an ; the
C.an ; a
D.the ; a
广告策划效果评估是指对广告活动的()评估,而不单纯指广告后期效果评估。