开发区环境影响评价中确定大气污染物总量控制选择的指标主要是( )。A．CO B．烟尘

以下程序段打开文件后，先利用fseek函数将文件位置指针定位在文件末尾，然后调用 ftell函数返回当前文件位置指针的具体位置，从而确定文件长度。请填空。 FILE * myf；long f1； myf= 【20】 ("test.t"，"rb")； fseek(myf,0，SEEK END) ； f1=ftell(myf)； fclose(myf)； printf("%d\n"，f1)；

图为我国某地形区典型地段的地形剖面示意图。读图完成问题。

小题1:该地形区可能位于我国的

A．塔里木河下游地区

B．长江中游地区

C．云贵高原

D．东北平原小题2:造成该地形区地表形态变化的主要外力及其地质作用分别为

A．流水、内力作用

B．流水、外力作用

C．风力、内力作用

D．风力、外力作用

在串联电路中，下列描述错误的为（）

A.各点电流一定相等

B.各点电压一定相等

C.总电阻值等于各电阻之和

D.ABC均不正确

astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost (141) . For example, the maintenance of multiple networks can require additional staff. Often, this staff must be trained on multiple vendor technologies, sometimes requiring parallel groups specializing in each (142) . Hence, additional maintenance procedures must be maintained and administrative records are (143) . The duplication of transport facilities to carry (144) network traffic is an inefficient use of resources. And not surprisingly, more technologies installed in a central office means the necessity for more physical space and an increase in power connections and power consumption, migration of these (145) network elements to IP-based DCns is alogical strategy.

A．prohibitive

B．feasible

C．connective

D．special

Prior to the UML, there was no clear leading (111) language. Users had to choose from among many similar modeling languages with minor differences in overall (112) power. Most of the modeling languages shared a set of commonly accepted concepts that are expressed slightly differently in various languages. This lack of (113) discouraged new users from entering the OO market and from doing OO modeling, without greatly expanding the power of modeling. Users longed for the industry to adopt one, or a very few, broadly supported modeling languages suitable for (114) usage.
Some vendors were discouraged from entering the OO modeling area because of the need to support many similar, but slightly different, modeling languages. In particular, the supply of add-on tools has been depressed because small vendors cannot afford to support many different formats from many different (115) modeling tools. It is important to the entire O0 industry to encourage broadly based tools and vendors, as well as niche products that cater to the needs of specialized groups.

A．internal

B．external

C．front-end

D．back-end