阀控式密封铅酸蓄电池存放期不宜过长,超过一年时应进行容量试验,若实放容量低于(),则该电池在工程中不得使用.
A.70%
B.100%
C.90%
D.80%
参考答案:D
在GSM-R系统中,频道配置采用等间隔配置方法,枢纽地区采用()复用模式,铁路沿线采用带状复用模式。
The man _______ was a friend of mine. [ ]
A. you just talked
B. whom you just talked to
C. who you just talked
D. which you just talked to