某车间需要用一台车床和一台铣床加工 A、B、C、D 四个零件。每个零件都需要先用车床

题型:单项选择题

问题:

某车间需要用一台车床和一台铣床加工 A、B、C、D 四个零件。每个零件都需要先用车床加工,再用铣床加工。车床和铣床加工每个零件所需的工时(包括加工前的准备时间以及加工后的处理时间)如下表。

 

若以 A、B、C、D 零件顺序安排加工,则共需 29 小时。适当调整零件加工顺序,可产生不同实施方案,在各种实施方案中,完成四个零件加工至少共需 () 小时。

A.25

B.26

C.27

D.28

考点:计算机软件水平考试高级系统分析师计算机水平考试高级系统分析师2008年下半年上午真题
题型:单项选择题

根据短文内容,填写正确的单词或句子。

Many people go to school for education. They learn languages, history, politics, math and so on. Others go to learn a kind of skill so that they can make a living. School education is very important and useful. Yet, no one can learn everything at school. A teacher can’t teach his students everything. The teacher only teaches them how to read and how to think. But the students themselves need to learn much more outside of school.

小题1:As a student, we go to school for _____________.

小题2:Jim wants to find a job, at first, he’d better go to school _____________.

小题3:If we want to know the development of our country, we must learn much _____ and _____ of school.

小题4:In class, the role of a teacher is _____________.

小题5:The student who _____________ is the best student.

题型:单项选择题

下列属于真核细胞但不具有细胞核的是()。

A.牛红细胞

B.鸡红细胞

C.小麦成熟筛管细胞

D.含多线染色体的果蝇唾液腺细胞

题型:单项选择题

为防止有机物挥发,可加一层水保存,即水封。下列有机物中,既能用水封法保存,又能发生水解和消去反应的是

A.乙醇

B.溴乙烷

C.乙酸乙酯

D.四氯化碳

题型:单项选择题

Was it on a lonely island ________ he was saved one month after the boat went down?[    ]

A. where  

B. that

C. which  

D. what

题型:单项选择题

经查实,某金融机构发现假人民币未收缴,按照规定,人民币由可以对该机构处()。

A、1000元以下罚款

B、1000元以上5万元以下罚款

C、5000元以上5万元以下罚款

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