A:35°
B:45°
C:55°
D:65°
We have made a survey among 1,000 students from a middle school about their favorite food. students like fruits according to the form.
Kind of food
Chocolate
Banana
Cookie
Apple
Percentage(百分比)
Of the students
20%
30%
15%
?
甲溶液的pH=6,乙溶液的pH=2,则下列叙述正确的是
2013年5月27日,一场名为“追寻时光印记”的老物件展览在重庆大剧院拉开序幕,3000多件老物件让我们感受到半个世纪以来的社会生活变迁。下列物件与20世纪70年代人们的生活密切相关的是