【单选题】Read the following passage and tell if the statements are true, false or not given. Holiday home When we went on holiday last year to a small town near London, my father knew all the landmarks. He kne...
【简答题】入院程序包括:( )、( )、( )、( )。
【简答题】三极管放大区,当管子的Ib为10μA时,Ic约为1mA,由此管子的β值约是( )
【单选题】She did not study hard, so she had to take the___.