【单选题】— How deep is the hole? — It is _____.
【单选题】-----How deep is the hole?---It is ________.
【判断题】组成一个局域网要有网络硬件系统和网络软件系统以及通信协议标准。()
【判断题】PN结的基本特性是具有单向导电性。( )
【单选题】We walked _____ into the forest.We _____ regret it. [ ]
【单选题】He dived_______into the river to save the girl and I was ______ moved by his deed.
【简答题】( )是破除社会发展障碍、激发社会发展活力的引擎,创新则是民族进步的灵魂,国家兴旺发达的动力