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问题 单项选择题

下肢深静脉在解剖学上有许多变异，本来是一条静脉却变异成两条，指出下列哪支静脉容易出现此种变异（）

A.髂总静脉

B.髂外静脉

C.股浅静脉

D.股深静脉

E.腘静脉

答案

参考答案：E

选择题

下列有机实验操作或叙述不正确的是（　　）

A．用四氯化碳萃取碘水中的碘单质

B．用热的纯碱溶液洗涤沾有油脂的试管

C．在实验室制取乙酸乙酯时，先将酒精与乙酸混合，然后再加入浓硫酸混合

D．乙酸乙酯中的少量乙酸可用浓的NaOH溶液除去
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单项选择题

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．agreement

B．understanding

C．characteristic

D．diversity
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