长为2个单位长度的木条放在数轴上，最少能覆盖＿＿个表示整数的点，最多能覆盖＿＿＿个表示整数的点。
如图,正方形OABC的边长为1,点D、E分别为、BC的中点,试求cos∠DOE.
用化学用语填空： (1)镁 ；(2) 2个氮气分子 ；(3)5个硫酸根离子 ； (4)甲烷 ；(5)+6价的硫元素
If you look for a book as a present for a child, you will be spoiled for choice even in a year there is no new Harry Potter. J.K Rowling’s wizard is not alone. The past decade has been a harvest f
Tom doesn’t like maths, ______ he likes Chinese a lot. A. and B. but C. or D. so
The weather turned out to be fine yesterday. I _______ the trouble to carry my umbrella with me. A. should have taken B. could have taken C. needn't have taken
万众瞩目的十一届全国人大三次会议和全国政协十一届三次会议于2010年3月5日和3月3日在北京开幕。回答下面试题。 全国“两会”在国际上受到越来越
在完全显性条件下，AaBbcc和aaBbCC的个体杂交，其子代中表现型不同于双亲的个体占全部子代的（ ） A.1／2 B.3／8 C.3／4
