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我们之所以不会受到太阳X射线、紫外线的伤害是因为地球上空的臭氧层的保护。()

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物理学的自然规律都是用微分方程表述的。()

紫外线可以用来杀死肿瘤细胞，治疗疾病。()

简述金融期货交易的风险防范机制。

？Write a memo to your company's department heads:
？explaining why you looked for a new supplier.
？saying who the new supplier is.
？asking for feedback about the goods that they supply.
？Write 40—50 words.