安培环路定理成立的条件是：（）。

单项选择题N.B，etc，etal，i.e， are examples of（）abbreviations.

A.technical
B.personal
C.commonly accepted
D.Postal

单项选择题Abraham Lincoln was the 16th president of the United States. He grew up in a log cabin in the state of Kentucky.He is the president responsible for the Emancipation Proclamation, the document abolishing slavery. He gave many speeches as president, and was the most eloquent president. He was assassinated on April 15,1865.（）

A.The statementis a fact.
B.The statement is an opinion.
C.The statementis a blend of both.
D.None of the above.