【单选题】The word grounds in Paragraph 5 is closest in meaning to______.
【判断题】超声波雾化吸入治疗毕,先关雾化开关再关电源开关,目的是避免损坏电子管。()
【判断题】分组交换采用的路由方式有数据报和虚电路。
【单选题】In the_____chapters, the professor has traced the redefinition of Britain's global position in recent decades.
【单选题】–The new museum of art is an unusual ______. --But it is designed by a very young architect.
【单选题】In march,2008, Medvedev was elected _______ president of Russia—________ position he will hold for 6 years.