A:g
B:2g
C:g/3
D:g/4
某学校为了了解八年级学生的体能情况,随机选取30名学生测试一分钟仰卧起坐次数,并绘制了如图的直方图,学生仰卧起坐次数在25~30之间的频率为____.
Name
Peter
Age
13
Nationality
American
Appearance(外貌)
Medium height, short blonde hair, wear glasses
Hobbies
Read books, play chess
Favorite food
Beef and carrot noodles, vegetable salad
Personality(个性)
·smart (learn well)
·friendly and popular(help others)
计算:-3xy24z•-8zy=____
My parents want to go _____________ on vacation, they are so tired these days.
手机是同学们非常喜欢的通讯工具,它是通过____传递信息的;太阳能清洁无污染,是人类能源的宝库,太阳能属于____ 能源(选填“可再生”或“不可再生”),研发太阳能汽车已是当今发展的趋势,它将太阳能最终转化成汽车的____.