配合直线回归方程是为了（）。 A.确定两个变量之间的变动关系 B.用因变量推算自变量

阅读判断正“√”误“×”。

      Beijing is a big city. It is the capital city of China. It has a long history (历史). There are many old buildings,

such as the Summer Palace, the Palace Museum, Tian'anmen Square and the National Museum. There are also

a lot of modern buildings. Beijing is very beautiful. We all love Beijing.

( ) 1. Beijing is a big city.

( ) 2. There are not many old buildings in Beijing.

( ) 3. Beijing is very beautiful.

( ) 4. There aren't any modern buildings in Beijing.

随着水平井段的增加，井内钻井液柱的激动压力和抽吸压力将（）

A、减小

B、增大

C、不变

D、不确定

CT平扫时，正常肝内静脉和门静脉的密度一般（）

A.低于肝实质

B.高于肝实质

C.等于肝实质

D.略高于肝实质

E.高于或等于肝实质

建设工程选址，应当尽可能避开不可移动文物；因特殊情况不能避开的，对文物保护单位应当尽可能实施( )。

A．原址保护

B．整体迁移

C．迁移保护

D．原貌保护

淤胆型肝炎除血凝血酶原活动度正常外，临床症状特点为（）

A.黄疸重，自觉症状重

B.黄疸重，自觉症状轻

C.黄疸轻，自觉症状轻

D.黄疸轻，自觉症状重