120阀适用于列车管压力500 kPa及600 kPa的货物列车。

Venice(威尼斯) is the "Queen" of the Adriatic Sea(亚得里亚海). Every year thousands of people from all over the world travel to Italy to visit the city. Do you know why they like to go there for a visit?

Venice is a very beautiful city. It is quite different from other cities in the world. There aren't any roads or streets in the city, so there aren't any cars or buses. There are many canals（运河）in the city. There is one big canal and one hundred and seventy-seven small canals. People move up and down the canals in boats to go to work, go shopping or visit their friends.

But Venice is sinking(下沉）It is going down and the water is going up. In 2040 Venice will be under water. The Adriatic Sea will cover (覆盖) the city. The Venetians(威尼斯人） love their city and want to stay there. So they want to save(拯救)Venice form the sea. They do not want to leave. How can they save Venice? They can build some strong huge walls and gates in the sea. The gates will close to keep too much water out. In this way Venice will not sink.

小题1:People from all parts of the world go to visit Venice because________.

A．it is beautiful and quite different from other cities

B．there are a lot of kinds of boats on the canals

C．there are 177 canals in the city

D．it is the most important city in Italy小题2: The Venetians usually go to work or visit their friends________.                                                 

A．by bus

B．in boats

C．in cars

D．on foot小题3: Year by year the Adriatic Sea ________ and Venice________.                                                       

A．is rising; is sinking

B．is going down; is going up

C．is going up; is going up

D．is sinking; is rising

患者男，28岁，因皮肤黏膜出血，发热10d入院。查体：贫血貌，皮肤可见瘀点和瘀斑，胸骨压痛（+），肝、脾肋下未及，外周血象：WBC33.54×10⁹/L，Hb75g/L，PLT31×10⁹/L，血涂片检查发现原始（幼稚）细胞。

为髓细胞系分化抗原的是（提示MPO染色阳性，氯乙酸AS-D萘酯酶染色阳性，α-乙酸萘酯酶（α-NAE）染色阳性，不被NaF抑制，结合细胞形态，诊断为急性早幼粒细胞白血病（M3），进一步做白血病免疫分型。）（）

A.CD15

B.CDl0

C.CD19

D.CD13

E.CD3

F.CD33

报纸通过有偿发行途径所销售的报纸数量是( )

A．自然销售量

B．总发行量

C．有用销量

D．净销售量

技术人员要（），提高能力。紧跟行业技术发展步伐，积极参与技术交流与学习。

A.加强学习

B.更新知识

C.追求卓越

D.提高技能

固定管板式换热器的具有结构简单，造价低和壳程容易清洗的优点。