套汇交易
You are the network consultant from passguide.com. You have been asked for which two features of optical networks allow data to be transmitted over extremely long distances?() Encryption。 Minimal signal loss。 Bandwidth limits。 No EMI。
热加工
婚姻关系是家庭关系的基础。()
工作场所具有良好的色彩环境可以得到哪些效果?
研究文昌鱼的发育,从而阐明了文昌鱼在动物界中的真正地位的科学家是()。