Atmer163的化学名称是()。
A、硬脂酸钙
B、单硬酸甘油酯
C、芥酸酰胺
D、羟乙基烷基胺
参考答案:D
阐述智能光网络方案主要解决的问题。
The quality of EGC messages is()affected by the position of the ship, the time of reception and climatic conditions.
A.sometimes
B.all times
C.never
D.partly