进行施工措施编写时所用的规范、标准等必须是具有法律性、指导性的文件。
参考答案：对
骤然跪倒着地发生的髌骨骨折是( )
A．压缩骨折B．横骨折C．斜骨折D．粉碎骨折E．嵌插骨折
Three hours _____ enough for us to finish the task. [ ]
a. are
b. has
c. is
d. were
