【单选题】在中国众多的河湖中,属于中国最大的湖泊的是
【单选题】Few airlines want to impose a total ban on their passengers using electronic devices because
A.
they don't believe there is such a danger as radio interference
B.
the harmful effect of electromagnetic interference is yet to be proved
C.
most passengers refuse to take a plane which bans the use of radio and cassette players
D.
they have other effective safety measures to fall back on
【简答题】A.All airlines have enforced a total ban on electronic devices during flights. B.Portable computers are confirmed as the greatest cause of aircraft crashes. C.It is difficult to predict how electromag...
【单选题】波浪线是局部剖视图中画成视图(表达外形)与画成剖视(表达内部结构)的分界线,下列主视图中的波浪线位置不合适的是?
【单选题】The loss of ability in the mother tongue is mainly caused by the use of electronic devices and a lack of attention to culture.