某建筑采用现浇整体楼梯，楼梯共4层自然层，楼梯间净长6m，净宽4m，楼梯井宽 450

深基坑支护基本形式中，边坡稳定式使用条件的表述正确的是（）。

A．基坑侧壁安全等级宜为二、三级非软土场地

B．土钉墙基坑深度不宜大于12m

C．当地下水位高于基坑底面对，应采取降水或截水措施

D．悬臂式结构在软土场地中不宜大于5m

E．基坑深度不宜大于6m

阅读理解。

     This is a picture of a bedroom. I can see a bed, a desk, a light (灯) and some books. The light and the

books are on the desk. The chair is behind (在……的后面) the desk. A photo of Jim's family is on the wall.

Father, Mother and Jim are in the photo. But we can' see his cat. It's not in the photo.

1. 写出bedroom picture 中出现的物品。 

    ______________________________________________

2. 根据短文内容，完成下列对话。

A: What can you see in the picture?

B: I can see a bed, a desk, a light and some books.

A: Where are these things?

B: (1) ________

A: (2) ________

B: The light and some books.

A: Where is the chair?

B: It's behind the desk.

A: (3)________

B: It's a photo of Jim's family.

A: Who are they in the picture?

B: (4)________

A: Where is Jim's cat?

B: (5)________

下列变化中前者属于化学变化，后者属于物理变化的是（　　）

A．汽油挥发粉笔折断

B．蜡烛燃烧粮食酿酒

C．海水晒盐动物呼吸

D．钢铁生锈冰雪融化

图中，在矩形ABCD中，横向阴影部分是矩形，另一阴影部分是平行四边形，根据图中标注的数据，计算图中空白部分的面积，其面积是（）

A．ac＋bc－ab＋c²

B．ab－bc－ac＋c²

C．a²＋ab＋bc－ac

D．b²－bc＋a²－ab

篮花