肿瘤细胞表面（） A.HLA－Ⅰ类抗原显著减少 B.HLA－Ⅰ类抗原显著增加 C.H

属于血清阴性脊柱关节病的是（）

A.结核性关节炎

B.银屑病关节炎

C.类风湿关节炎

D.痛风性关节炎

E.骨关节炎

–I will go to Qingdao for a visit with my family.

– ___________.

A．So do I

B．So I do

C．So will I

D． So I will

“十二五”时期，国家按照适度超前原则，统筹各种运输方式发展，构建()的综合运输体系。

A.便捷、安全

B.安全、高效

C.便捷、安全、髙效

D.便捷、高效

某化工企业排放的废水中含有FeSO₄、H₂SO₄、Ag₂SO₄以及一些污泥。某化学研究小组为了帮助该企业科学处理污水，拟利用该厂的废铁屑（有少量锈斑、油污）、纯碱溶液和硫酸处理此污水，并从中回收

FeSO₄·7H₂O和Ag。他们设计的工艺流程如下

请回答下列问题：

(1)写出下列各步操作的目的或名称：Ⅱ______、 V________。

(2)操作Ⅱ用Na₂CO₃溶液处理的原因是（用离子方程式表示）_______________。

(3)写出过程①中发生的所有反应的离子方程式：_____________________

(4)过程②的目的是_______________。

(5)工业上在用FeSO₄·7H₂O生产水处理剂的过程中，要将Fe²⁺氧化为Fe³⁺。写出在酸性介质中用NaClO₃氧化FeSO₄·7H₂O的离子方程式_____________________。

A patrol team of sea lions and dolphins featured in a large-scale military exercises being conducted by the U. S. and its allies in the Pacific Ocean. The machine (1) took part in simulated mine recovery and mine detection missions during the biennial Rim of the Pacific Exercise (RIMPAC) war games. The (2) started on June 19 and will run (3) Friday.
"There are a number of mechanical systems that work in those areas. (4) high-tech gadgets deployed by the military can’t (5) the natural skills of dolphins and lions," said Tom Lapuzza, spokesman for UN Navy’s Marine Mammal Program. Sea lions have "incredible good underwater (6) " and can dive down to 300 meters to catch a recovery line to a mine, he said. Dolphins use sonar to (7) mine.
Human beings have a long (8) of training animals to join the military. Horses have been the most widely-used animals (9) the recorded history of (10) . In early times, horses were used to (11) chariots or to (12) armored forces. With the development of modem weapons and motorized (13) , the use of horses for military purposes fell into (14) . (15) , horses were still used (16) by the German army during World War II for transporting (17) and equipment, including artillery.
During World War II, (18) with explosives strapped to their backs were used as anti-tank weapons. In other (19) , they were used for detecting mines. Some dogs were also used as messengers.
Other animals have also (20) in the military. Recorded history shows the use of elephants for military purposes as early as 1,100 B. C.. They were employed during World War II by both the Japanese army and the (21) .
There are records showing that over 100,000 reindeer were used by Finland to tow sleds during World War II. They carried the (22) to hospitals, brought supplies to the troops and moved heavy anti-tank weapons. It is well documented that oxen have been (23) used in war as improvised beasts of burden. During World War II, spiders were employed by the Allies to spin silk for (24) in cross-hairs on bomb scopes and other optical instruments. People also are finding that Vampire bats’ ability to use echolocation is very interesting as we (25) to learn how it works and it may benefit the army.