在胶轮车运行的路段发现有坑洼地段,必须及时用石子进行充填。
参考答案:对
有牙龈萎缩者下列哪种刷牙方法最好()
A.轻刷法
B.水平颤动法
C.竖转动法
D.重刷法
E.横刷法
It is a () process throughout a project. A requirement is a capability to which a projec toutcome (product or service) should conform.
A.persistent
B.continuing
C.permanent
D.continuous