△ABC中，∠A+∠B=∠C，∠A的平分线交BC于点D，过D作DE⊥AB于E．若CD=2cm，则DE为（ ）cm．
2
_______ my father _______ my mother is able to use a computer. However, I can. [ ]
A. Both; and
B. Neither; nor
C. Either; or
D. Not only; but also
防水混泥土结构裂缝宽度不得大于（）
A、0.2mm
B、0.3mm
C、0.2mm
D、0.4mm
