男，47岁，查体时B超发现肝右叶约6cm实性占位病变，突出于肝脏表面。CT示肿块未侵

为响应“美丽河池 清洁乡村 美化校园”的号召，红水河中学计划在学校公共场所安装温馨提示牌和垃圾箱。已知，安装5个温馨提示牌和6个垃圾箱需730元，安装7个温馨提示牌和12个垃圾箱需1310元。

（1）安装1个温馨提示牌和1个垃圾箱各需多少元？

（2）安装8个温馨提示牌和15个垃圾箱共需多少元？

下列关于江湖洲滩地区感染性钉螺面积的计算表述中，属于错误的是（）.

A.发现1个孤立感染性螺点，向四周各延伸50m，即按1hm2计算面积

B.若2个感染螺点相邻在50m以内，以2螺点距离相加，再向四周各延伸50m，计算感染性钉螺分布面积

C.若各感染螺点相邻超过50m，以孤立螺点计算感染螺面积

D.若孤立感染性螺点自然环境小于1hm2，按1hm2计算面积

“其身正，不令而行，其身不正，虽令不从”体现了行政道德的（）。

A．强制性

B．示范性

C．广泛性

D．政治性

体内钙离子的生理功能，下列哪项是错误的

A．可增加毛细血管和细胞膜的通透性，降低神经肌肉的兴奋性

B．作为凝血因子Ⅳ，参与凝血过程

C．骨骼肌中的钙离子可触发肌肉兴奋-收缩耦联

D．作为第二信使，发挥重要作用

E．是许多酶(如3ATP酶、脂肪酶)的激活剂

The fact that most Americans live in urban areas does not mean that they reside in the center of large cities. In fact, more Americans live in the suburbs of large metropolitan areas than in the cities themselves.
The Bureau of the Census regards any area with more than 2,500 people as an urban area, and does not consider boundaries of cities and suburbs.
According to the Bureau, the political boundaries are less significant than the social and economic relationships and the transportation and communication systems that integrate a locale. The term used by the Bureau for an integrated metropolis is an MSA, which stands for Metropolitan Statistical Area. In general, an MSA is any area that contains a city and its surrounding suburbs and has a total population of 50,000 or more.
At the present time, the Bureau reports more than 280 MSAs, which together account for 75 percent of the U.S. population. In addition, the Bureau recognizes 18 megapolises, that is, continuous adjacent metropolitan areas. One of the most obvious megapolises includes a chain of hundreds of cities and suburbs across 10 states on the East Coast from Massachusetts to Virginia, including Boston, New York, and Washington D. C. In the Eastern Corridor, as it is called, a population of 45 million inhabitants is concentrated. Another megapolis that is growing rapidly is the California coast from San Francisco through Los Angeles to San Diego.

According to the Bureau of the Census, what is an urban area

A．A chain of adjacent cities.

B．An area with at least 50,000 people.

C．The 18 largest cities.

D．An area with 2,500 people or mor