纳税人开采或生产应税资源产品销售的，以应税产品的产量为课税数量。（）

1985年，科学家发现一种新的分子组成的物质，其化学式为C₆₀，下列有关的说法不正确的是（　　）

A．它的式量为720

B．它是一种单质

C．它是一种化合物

D．它在氧气中燃烧的产物和碳在氧气中燃烧的产物相同

作业环境中的危险点称为设备固有危险点或动态危险点。（）

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (52) an educational institution, and they are required to study for a (53) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (54) resources to support themselves (55) in this country.

In order to work here the foreigner needs a work permit, (56) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (57) these permits, and there is little that can be done (58) it; it would be extremely unwise for a foreign visitor to work (59) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (60) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (61) part-time jobs while they are studying here.

55().

A.after 

B.since 

C.while 

D.before

试题四（共15 分）阅读以下关于80X86 处理器方面的叙述，请回答问题1 至问题3，将解答填入答题纸的对应栏内。【说明】80X86 计算机中的寻址方式包括程序寻址和数据寻址两类。数据寻址方式是指获取指令所需的操作数或操作数地址的方式；程序寻址方式是指程序中出现转移和调用时的程序定位方式。部分数据寻址方式见表4-1，其中，为每种数据寻址方式分配一个编号。

【问题3】（4 分）以下汇编程序用于求寄存器AX 中符号数的绝对值。请将下面汇编程序的空（1）～（4）补充完整，并将解答填入答题纸的对应栏中。 CMP AX,（1） JL（2） JMP（3）YESNEG: NEG AXNONEG: MOV RESULT,（4）将上述汇编程序改进如下，请将改进后的汇编程序的空（5）～（8）补充完整，并将解答填入答题纸的对应栏中。 CMP AX,（5） JGE（6） NEG（7）NONEG: MOV RESULT,（8）

自然循环锅炉蒸发设备由（）、（）、（）、联箱及一些连接管等部件组成。