It is a good plan in theory, but it _____ to be seen whether it works in practice.

A．keeps

B．stays

C．stands

D．remains

新建SDH网络时工程现场常规不需进行测试的光口指标是（）。

A.光口输出抖动

B.光口输入抖动容限

C.光口频偏

D.眼图