攀登作业时供人上下的踏板，其使用荷载规定为（）。 A.1100N B.750N C.

X、Y、Z、W是四种不同的金属，为比较金属活动性的强弱，某同学利用这四种金属单质、盐酸、Z的硝酸盐、W的硝酸盐，进行有关实验，结果如下表（能发生置换反应的记为“√”，不能反应的记为“一”，无标记的表示未做该实验）．这四种金属的活动性顺序为（　　）

A．Y＞W＞Z＞X

B．X＞Y＞W＞Z

C．W＞X＞Y＞Z

D．X＞W＞Y＞Z

We will climb the mountain tomorrow _______ it doesn't rain. [ ]

A. if

B. although

C. since

B

Las Ramblas is the most famous street in Barcelona. Especially in summer, thousands of tourists go the seaside by passing through this street, making it a centre of shops and bazaars. Not only can you find tourists there, but also thieves, swindlers, cops--- among whom the living statue artists are the most special group. They were covered with greasepaint（化妆油) in different colors, wearing season-disproportional clothes, standing on a pedestal for several hours without making even a single move. Are they real or fake, the guests were wondering--- and then suddenly the statues came to life, just for a few seconds to shift positions. But the movement of the statues seemed like someone just had breathed life into them. They really do look like statues, and that’s how they got their names.

Usually there is a jar or a hat in front of them. They would change to another pose whenever some tourists put a coin in the hat. You may take photos after giving a Euro, or even less, but be careful not to touch the statues, unless you want yourself to be covered in paint. It’s a really special experience, don’t you think?

60. Why is Las Ramhlas the most famous street in Barcelona?

A. It is a place where people come for holiday.

B. It is in Barcelona that makes it famous.

C. Thousands of tourists go to the seaside by passing through this street.

D. It is a center of trade.

61. Why are those persons called living statues?

A. They were covered with greasepaint in different colors.

B. They were wearing season-disproportional clothes.

C. They are standing on a pedestal for several hours without making even a single move.

D. Their movement seemed like someone just had breathed life into them.

62. Which of the following statements is NOT TRUE?

A. There are tourists, thieves, swindlers, cops and living statues in the famous street.

B. The persons who make living statues want to earn money by this way.

C. Taking photos with living statues is free.

D. People can touch living statues

63. Which kind of persons are most special in Las Ramhlas street?

A. Tourists           B. Thieves          C. Guides         D. Living statues

直接证据

吊耳、耳轴出现哪种情况应做报废处理？