不变

A gunboat in the lake from the bow, stern uniform suddenly while traveling forward and backward, the emission of a shell consists of two rounds relatively the same rate the quality of the same traction and resistance to change is the ship's momentum and velocity is what?...

一炮艇在湖面上匀速行驶突然从船头船尾同时向前和向后各发射一炮弹设两发炮弹质量相同相对地的速率相同牵引力和阻力不变则船的动量和速度的变化是怎样的？。。。

In this paper, we mainly concern the persistence of lower-dimensional invariant tori in generalized Hamiltonian systems.

本文主要研究广义Hamilton 系统的低维不变环面的保持性。

Shen When you are tired of the same wall, then you will love the hand-painted.

当你厌倦了一沉不变的墙面，那么你一定会喜欢上手绘背景墙的。

This is not a hard and fast rule.

但这并不是一个牢靠不变的规则。

Scientists, we believe, deal with that which is hard and fast.

我们认为科学家所处理的是确定、不变的对象。

The readings describe and recommend a number of such cleansing aids, but do not lay down hard-and-fast rules for their use.

解读里面描述和推荐了很多这样的帮助洁净的方法，但却没有留下1成不变的关于应用的规则。

It is the hot study topic how to improve the spatial resolution under the condition of settled hardware configuration.

在硬件配置不变的情况下，如何进一步提高CT系统空间分辨率是目前工业CT领域内的研究热点之一。

Points out that the switching frequency、the input inductance and the output power all have great contribution to the input-current THD. When the output power goes up, the input current harmonic content keeps almost constant, thus the THD goes down.

指出开关频率、输入电感和输出功率对输入电流THD有显著影响，发现整流器输出功率增加时，输入电流谐波含量基本不变，从而输入电流THD减小。

B.In simple harmonic motion,where there is no damping,the energy of the vibrating patticle

在没有阻力的简谐运动中，振动质点的能量由动能变为势能，或由势能变为动能，但总能量不变。

2In simple harmonic motion,where there is no damping,the energy of

在没有阻力的简谐运动中，振动质点的能量由动能变为势能，或由势能变为动能，但总能量不变。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。