【单选题】SS9型电力机车上采用JLl4系列交直流电磁继电器作为主电路原边( )保护和辅助电路过流保护。
【单选题】二极管电路如图所示,设二极管为理想的 ,则图中的输出电压V0为
【单选题】Most native speakers of English will ___________ in a regular college essay of about 700 words.
A.
usually end the paragraph with a topic sentence
B.
arrange the body paragraphs from the strongest to the weakest
C.
develop a paragraph in a circular fashion
D.
arrange the body paragraphs from the weakest to the strongest
【简答题】交直流型电力机车通过()将接触网供给的单相工频交流电引入机车内部。
【单选题】The type of uncertainty among native speakers would most likely occur in a conversation between ______.
B.
a father and his daughter
C.
a scientist and a worker
D.
a lawyer and his client
【简答题】The _____ language used in most international organizations is English. A.official B.native C.frequent D.separate