设f（x）、g（x）都是单调函数，下列四个命题中正确的是( )①若f（x）单调递增，g（x）单调递增，则f（x）－g（x）单调递增;②若f（x）单调递增，g
A型血型色觉正常的女人曾结过两次婚，第一个丈夫的血型为B型，且色盲；第二个丈夫血型为A型，色觉正常。此妇人生了4个小孩，这4个小孩中可能是第
下列各组词语中，加线字的读音完全不相同的一项是（ ） A．否决／否极泰来 渐进／东风西渐 扛枪／力能扛鼎 B．疏浚／怙恶不悛 啜
In 1930, a young African American, Vivien T. Thomas, a professional carpenter, was hired as a lab assistant by a famous white doctor named Dr. Alfred Blalock. Although he 36 went to college, he ha
请你用化学知识解释成语： （1）釜底抽薪： 。（2）钻木取火： 。
在图所示的四幅图中，正确标明了通电导线所受安培力F方向的是( )
若实数m满足m2－m + 1 = 0，则 m4 + m－4 = ．
Volunteers, as an essential part of a successful world exposition, are a major channel for the public to join in, serve and share the world exposition and a means to show the image of the host coun
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