氢冷发电机氢气干燥器是如何进行工作的？

Christmas is a wonderful time of the year. Have yourself a merry homemade holiday. Reindeer carrying Santa with carols (圣诞颂歌) filling the air. It is a time for Christmas ornaments (装饰), gift, and twinkling lights. Shopping, wrapping parts full of giving. Trees for parents, toys for children, and flowers for your lever. Miracle will be made with love and your own two hands. A festive occasion, along awaited day. So do not hesitate to join our special fair.

The ongoing Laitai Christmas Sale can be found on the third floor of the Laitai flower and plant market and will nm until December 26th.

Christmas trees, gorgeous candlesticks, delicate garlands and collection...you can find anything you want for the splendid holiday!

A design of decorative hoops for Christmas will be specially offered to hotels, halls and restaurants.

During the sale, anyone who has an invitation will get a small gift.

Laitai Christmas Sale

The place: the third floor of Laitai (1) market

Time: until (2)

Goods: 1) (3) , gorgeous candlesticks, delicate garlands and collection of ornaments and decorations

2) a design of decorative hoops specially offered to hotels, (4)

Good news: During the sale, anyone who has an invitation will get a (5)

1（）

（）是报价的基础和前提，也是招标人评标时要考虑的重要因素之一。

A．投标须知

B．招标公告

C．施工方案

D．设计方案

根据等电子原理，由短周期元素组成的粒子，只要其原子总数和电子总数相同，均可互称为等电子体。等电子体之间结构相似、物理性质也相近。以下各组粒子不能互称为等电子体的是[ ]

A．CO和N₂

B．O₃和SO₂

C．CO₂和N₂O

D．N₂H₄和C₂H₄

一台起重机匀加速地将质量m=1.0×10³kg的货物由静止竖直吊起，在2s末货物的速度v=4m/s．取g=10m/s²，不计额外功．起重机在这2s内的平均功率为______W，起重机在这2s末的瞬时功率为______W．

关于产品质量合同责任与产品侵权责任的比较，下列说法正确的有( )。

A．产品质量合同责任要求当事人之间有合同关系，而产品侵权责任则不一定要求当事人之间有合同关系

B．产品质量合同责任的主体仅限于合同当事人，产品侵权责任的主体不限于合同当事人

C．产品质量合同责任和产品侵权责任均适用过错责任的原则

D．产品质量合同责任和产品侵权责任均实行举证责任倒置