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【单选题】
The development of optical fiber over the last twenty years has resulted in the production of optical fiber cables that exhibit very low attenuation and transmission loss in comparison with the best copper conductors.A.
cause very small reduction in the power of signals traveling over them
B.
make very severe enhancement resulting in loss of transmission
C.
show very weak coupling and infrequent transmission failure
D.
attract very little attention so as to cause transmission degradatio
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【多选题】在总平面图中, ( )画法和标注方法是正确的。
A.
粗实线绘制拟建房屋，细实线绘制原有房屋
B.
用小同点表示建筑楼层数，单层的房屋可不标注
C.
一般按上东下西方向绘制，可向左或右偏转，但不宜超过45度
D.
房屋定位都采用建筑坐标
E.
首层室内标高，按相对标高注写。