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Are there ways to measure instantaneous speed directly, or is instantaneous speed always a value that must be derived from average speed measurements?

有没有方法可以直接测量瞬时速度，或者是否瞬时速度总要由平均速度的测量值求导得出？

On this basis, some philosophers suggest that general moral rules can be derived from reason, according to Kantian ethical rationalism, or by intuition, according to ethical intuitionism.

也有道德学家认为，应从具体的道德事实出发，然后上升为较为宽泛的原则〔如罗斯的直观通俗理论〕。道德学中的另一问题，是如何证明一种道德信仰的合理性，及如何变道德信仰为道德知识。

Ota lesions scattered in the trigeminal nerve, two regional, Ito nevus distribution in the post and arm lateral supraclavicular nerve innervation area, according to the characteristics of nerve cells may be derived from melanocytes prompted local nerve tissue.

大田病变分布在三叉神经，两个区域，伊藤痣分布在后锁骨上神经及臂外侧神经支配的区域，根据神经细胞的特征可能是由黑色素细胞产生促使当地神经组织。

Strumal carcinoid of ovary may be derived from multidirectional differentiations of endodermal origin with low potential malignancy.

卵巢甲状腺肿类癌起源于内胚层，低度恶性，诊断主要依赖病理和免疫组化，需要与颗粒细胞瘤、卵巢恶性甲状腺肿、卵巢类癌等鉴别。

In the low-low satellite to satellite gravity mission, the intersatellite range and range-rate data are the observable values, while the intersatellite acceleration can be derived from the range-rate through digital differential. Using acceleration data, people can avoid solving the variation equations of the satellite motion and simplify the observation equations. But on the other side, the digital differential will amplify the observation noises and finally affect the solved geopotential accuracy.

低低卫星跟踪卫星的观测量是两低轨卫星的星间距离或星间速度，星间加速度由星间速度通过数值微分导出，用星间加速度作为观测量可以避免解算卫星运动的变分方程，简化观测方程的建立，但数值微分会使观测噪声放大，从而影响重力位的解算精度。

Its cDNA had been cloned by RT-PCR. The results of comparison on sequence homology suggested that Luffin P1 may be derived from a vicilin like precursor which is a storage protein in the seeds of Luffa cylindrica.

本文利用3'RACE法克隆了它的cDNA，并构建了它的融合表达质粒pGEX-4T-S2，该质粒在大肠杆菌中获得了成功表达。

In nitrogen-fixing populations this 'new' nitrate and nitrite can be derived from the assimilation of nitrogen gas.

这些自己"堆肥"的豆科植物还能在其根瘤中的共生细菌的帮助下固定大气中的氮，从而将氮循环的主要步骤综合在一种生物中。

There are a number of positive elements that can be derived from the giving of a personalized baby gift.

赠送这种礼物有大量的优点。

Through the comparison between R. M. Hare's ethic deductive theory and the two versions of rational prescriber's theory, the writer finds that utilitarianism can be derived from a theory of the type of rational choice only if the hypothesis is held that the chooser is in all parties' places with equal probability.

通过比较黑尔的道德推理理论和两个版本的理性立约者理论，可以发现，理性选择论类型的理论，如果要导出功利主义的结论，都需要假定选择者以相等的概率处于有关各方的地位上。

SSR loci were proved to be derived from the Island Cotton primogenitor by compared all polymorphic marker loci with the Island cotton primogenitor (Ashimouni, a famous Egypt Island cotton cultivar) and the standard genetic line (TM-1) of Upland cotton.

利用这些引物进一步和TM-1、优质纤维渐渗片段的供体Ashimouni作比较，初步鉴定出10个SSR位点与海岛棉渐渗有关。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。