已知f(x)=log2(4﹣ax)在区间[﹣1,3]上是增函数,则a的取值范围是____
我国古代科技成就斐然、文化名人辈出,以下组合正确的是( )
例
uncle
Play tennis
1
aunt
Playing football
2
sister
Playing basketball
3
teacher
Playing ping-pong
4
mother
Playing volleyball
例:My uncle is playing tennis.
(____) 1. A. shine B. ship C. school D. shop
(____) 2. A. book B. cook C. food D. good
(____) 3. A. which B. who C. what D. where
(____) 4. A. dress B. drink C. drive D. tree
(____) 5. A. think B. mouth C. there D. thank
弹力的方向一定与施力物体形变的方向____相反(填“相同”或“相反”)
如图为一种常染色体上显性基因(A)决定的遗传病系谱图,Ⅱ代中,基因型为Aa的个体是( )