【单选题】Which of the following statements about compulsory education around the world is NOT true?
A.
The average of compulsory education around the world is 7.85 years.
B.
The duration of compulsory education around the world ranges from 1 to 13 years.
C.
The duration of compulsory education in the US is 12 years.
D.
The duration of compulsory education in the UK is 12 years.
【单选题】下列有关楼梯踏步的最小宽度和最大高度,哪一组是正确的?
A.
住宅公共楼梯踏步最小宽度250mm,最大高度190mm
B.
住宅户内楼梯踏步最小宽度220mm,最大高度200mm
C.
幼儿园楼梯踏步最小宽度260mm,最大高度150mm
D.
商场公用楼梯踏步最小宽度280mm,最大高度160mm
【判断题】住宅共用楼梯踏步宽度最小是 260mm ,最大高度是 175mm
【单选题】课堂上展示的大油罐变瘪,主要原因是
C.
用热水冲洗油罐后封口,气温下降后里面的水蒸气液化后气压降低,被大气压压瘪的
【简答题】A.profitable B.voluntary C.accidental D.compulsory
【单选题】中国社会中的“潜规则”时常存在,有时甚至取代正式法规。表明