(2013·山东济宁模拟)New computers are soon out of date since newer models are ________ constantly.

A．turned up

B．turned out

C．turned down

D．turned over

甲地抗震设防烈度为6度，乙地抗震设防烈度在6度以下，设计同样门式刚架房屋，按经济合理及规范规定，应采用的钢材牌号分别是______。

A．Q345、Q345
B．Q345A、Q345A
C．Q345B、Q345B
D．Q345B、Q345A