―          the shop          for several years?

―No, it          one year ago.[ ]

A. Has; been open; opened          

B. Is, opened; opened

C. Has, opened; was open          

D. Was, opened; was opened

防振动时，采用工程控制技术措施达不到要求的，应根据实际情况合理设计劳动作息时间，并采取适宜的( )措施。

A．场源屏蔽
B．距离防护
C．个人防护
D．合理布局