题目内容

函数y=sinx有多少个极值点

A. 没有
B. 无穷多

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函数y=sinx有多少个拐点

A. 没有
B. 无穷多

The history period for the story in the film is 1960’s America, the period in which _______was still in clashes frequently.A. slavery B.C.D.

A. slavery
B. prejudice
C. racial discrimination
D. freedom

This film is based on _______.A. a novel B.C.D.

A. a novel
B. a social issue
C. a biography
D. a true story

On September 22, 1862, ______issued a preliminary emancipation proclamation

A. Franklin
B. Lincoln
C. George Washington
D. Obama