Physical exercise has direct impact on middle school students' optimism. It can impose indirect influence by the two intermediary variants of self-efficiency and classmate relation.

They are most inclined to classmate relation harmony, a bosom friend in the side can at any time to provide warmth and support is happy.

他们最倾向于同学关系的和睦，有知心朋友在身边能随时提供温暖和支持则感到幸福。

Girls score higher than the boys notably in interpersonal relationships, interpersonal association, classmate relation, classmate communication, and classmate associate.

女生在人际关系以及人际相处、同学关系、同学交往、同学相处4个分因子上的得分显著高于男生。

Research on Dynamic Performance of 120 km/ h B Type Metro Vehicle

120km/hB型地铁车辆动力学性能研究

The Performance of 300 km/ h High Speed Train

300km/h高速列车的车辆性能

Design and Analysis of 160 km/ h Freight Car Braking System

160km/h货车制动系统的设计与分析

Design of Air-Conditioning System for 200 km/ h Track Inspection Car

200km/h轨道检测车空调系统设计

Microcomputer control system of 200 km/ h power concentrated EMUs

力集中式200km/h电动车组的微机控制系统

In early graphics systems, the blitter was a key component for efficient rendering, as it could rapidly copy and manipulate pixel data in parallel with the main CPU.

在早期的图形系统中，blitter 是高效渲染的关键组件，因为它能够并行于主 CPU 快速复制和处理像素数据。

Being in the upper atmosphere they are blown by the winds in these areas and can drift at speeds of up to300 kilometres per hour.

是在上部大气他们由风吹在这些区域，能漂移以300公里的速度每小时。

It did not fly very fast: only at48 kilometres per hour.

迅速飞得不很多：只是在每个小时48公里。

Travelling at a speed of over 400 kilometres per hour, the train can complete the 30 kilometre journey in eight minutes.

火车以每小时400公里的时速前进，在8分钟内就完成了30公里的路程。

El Pais newspaper said the train entered the bend at 190 kilometres per hour while the speed limit on that stretch of twin tracks was 80 kilometres per hour.

西班牙国家报表示列车进入转弯段时时速达190千米，而该段双轨道的限速是80千米每小时。

This car will do 180 kilometres per hour if I drive it flat out.

如果我用最高速度行驶的话，这辆汽车的时速将达到每小时160公里。

The designated speed is 100 kilometres per hour, and the designed longevity is more than 100 years. The total investment on the bridge was RMB 11. 8 billion.

设计时速100千米，设计使用寿命100年以上，总投资118亿元。

The aeroplane can go at1200 kilometres per hour.

这飞机一个钟头能飞1200公里。

These massive bodies of water and mud travelled at around 60 kilometres per hour and, when they passed through towns and villages they simply took down all he houses and people that they encountered; being responsible for the deaths attributed to the volcano.

巨量的水体和泥土以约六十公里的时速奔涌，席卷了沿途所有的城镇和村落。房屋和居民被悉数吞没，导致此次火山喷发死者众多。

Weighing nine kilograms and with a 2.2-metre wingspan, this giant of the. sky glides at 65 kilometres per hour over dense Brazilian rainforest.

体重九公斤，翼幅达2.2米的空中巨物在茂密的巴西雨林上空以每小时65公里的速度滑翔。

The speed of the car was85 kilometres per hour.

这汽车的速度是每小时八十五公里。

Early trains, like the Rocket, had a top speed of 50 kilometres per hour.

早期的火车，像火箭，最高时速是50千米。

My car can go 140 kilometres per hour.

我的汽车每小时能跑一百四十公里。