计算题：已知电梯速度为1.75m/s，计算耗能型缓冲器的缓冲行程？若梯速为4m/s，缓冲行程又为多少？
参考答案：
用一根长27dm的铁丝做一个长方体框架，使它的长、宽、高的比是4：3：2．在这个长方体框架外面糊一层纸，至少需要多少平方分米的纸？它的体积是多少立方分米？
Subjects and ______ are not so frequently omitted in English as in Chinese，as illustrated by the sentence “This book is very interesting，Would you like to read it”
