SDH自愈环结构可划分为两大类,()
A.光电保护环
B.通道保护环
C.复用段保护环
参考答案:B, C
She with him because he was late again. [ ]
A. annoyed
B. annoying
C. is annoying
D. is annoyed
小明找来一叠信纸,要测量一张信纸的厚度。为了减小误差,他进行了多次测量,测量的有关数据如下表:
(1)从小明测量的数据可知,他使用的刻度尺的分度值是多少?
(2)请把表格填完整。