写出欧拉方程和第二欧拉方程，并简述其物理意义。

脉搏压

在H、O、Cl、C、Na几种元素中，选择元素组成符合下列要求的物质（写化学式）．

（1）实验室制取氧气的反应物______；

（2）可用于除去铁锈的酸______；

（3）可用于焙制糕点时的发酵粉______；

（4）可作凋味品和防腐剂______．

下图为某市区空气污染的空间分布形态和该市4月份气温垂直分布图，回答下列各题。

小题1:根据“空气污染的空间分布形态图”，分析该城市该月的盛行风向主要为(    )

A．东南风

B．西南风

C．西北风

D．东北风小题2:观察该市4月份气温垂直分布图，甲乙丙丁四图中大气污染最严重的是(  )

A．甲

B．乙

C．丙

D．丁小题3:若该地气温由甲图逐渐演变到丁图所示状态，则造成气温垂直变化的原因可能是

A．锋面气旋过境

B．冷锋过境

C．连续阴雨

D．台风影响

Gardens of Claude Monet in Giverny Flowers, color, and light are essential elements in interior decorating. And nowhere are these more evident than in the home and gardens of Claude Monet in Giverny, France. Filled with the bright, clear colors of nature, this home is a must-see for anyone who loves art, flowers, color, or decorating. It is especially remarkable because the usual decorating of the day included heavy curtains, large velvet upholstered pieces, and dark, somber interiors. Monet broke from that tradition when he moved here in 1883, enchanted by the quiet village of Vernon, rolling country hills, pretty trees and fields all laid out gracefully along the banks of the Este River. Monet was still a struggling artist when he arrived in Giverny. It was one of his paintings that had given this new arts movement its name-"Impressionism"-for the use of dabs of color on canvas, rather than sweeping brushstrokes or more classic painstaking detail. While at first reviled by critics impressionism began to grow in popularity and buy 1890 Monet’s art was selling well enough that he could afford to purchase his rented home for the price of 22,000 francs, equal to the price of just two or three of his paintings. He stayed in this home for the rest of his life, until 1926. Monet’s love of pure color is fully expressed in the decoration of his home. Outside, bright pink stucco walls contrast with forest green shutters. Inside, brilliant yellow hues brighten the dining room while lovely watery blues and greens grace the entry. In the kitchen two tones of blue burst into a riot of color, highlighted with copper pots and blue and white tiles from Rouen. On display in the dining room is the matching yellow china wares filled with a collection of blue and white china pieces as well as the yellow and blue banded dinnerware he had commissioned in his own design. In the center, a large table is set for the family and guests. A pretty fireplace at the end of the room shows off blue and white tiles under a mantle decorated simply with an arrangement of bottle green vases. Japanese prints cover the walls. The home is one room deep and about five rooms wide, each with windows overlooking the magnificent gardens where great care was taken in the planning and planting. Monet eventually expanded his land to include a small stream, pond, and water lily gardens on an adjacent properly. At one point he employed a staff of six gardeners to care for the grounds and keep the gar-dens supplied with flowering blooms. It is the gardens that seem to be the focal point of the home. Laid out in neat rows, with paths, archways, and color, Monet oversaw every de- tail. Strolling through them, one almost expects to come upon the scene of Monet paining, his wife and a child in front of his magnificent rose garden. Join us for a beautiful photo tour of Monet’s gardens.

In the last paragraph, the sentence "It is the gardens that seem to be the focal point of the home. " means ______.

A．The garden is very small, but beautiful

B．The garden is very big and beautiful

C．When people visit his home, they like to visit the garden most

D．People like to take pictures in his garden

投资者不直接参与投资企业的经营和管理的投资方式称为（）

A、直接投资

B、间接投资

C、长期投资

D、举办合资