为使脚手架有足够的强度和刚度,以保证其牢固和稳定,必须进行( )。
A.设计计算
B.材料强度试验
C.材料刚度试验
D.按经验搭设
参考答案:B
下列句子均有错误,选出错误并在横线上改正。
( ) 1. There is many books on the shelf.
A B C
( ) 2. Do you likes my room?
( ) 3. What is your room likes?
( ) 4. There is two end tables in my room.
( ) 5. The tiger has four leg.
如何提高学生知识储备的数量与质量