作图题:
(1)小女孩用80N的力将水桶提起(如图1甲所示),请在图1乙中画出女孩提桶力的示意图。
(2)在图2中画出点S在平面镜中成像的示意图。
图1 图2
(1)
(2)
Could you help _____, please? [ ]
A. he
B. she
C. her
D. his
根据《长途光缆波分复用(WDM)传输系统设计规范》,新建传输机房不宜采用活动地板。