常用的分集技术和合并技术有哪些？

试验员在进行混凝土抗压、抗折试验，请结合实际回答以下问题（多选题）：

以下有关混凝土抗折试验中所用试件说法不正确的是

A、边长为150mm的立方体是标准试件

B、边长为100mm的立方体是标准试件

C、边长为100mm的立方体是非标准试件

D、边长为200mm的立方体是非标准试件

E、特殊情况下，可采用Φ150mm×300mm的圆柱体试件

B2B易的特点和优势？

In the following passage, there are 25 blanks representing words that are missing from the context. You are to put back in each of the blanks the missing word. Write your answers on the ANSWER SHEET. The time for this section is 25 minutes.
Of all the employed workers in the United States, 12.5 million are part of a temporary workforce. The United States Bureau of Labor Statistics counts 9.2 percent of workers as those who have (1) they term "alternative employment arrangements." The government predicts that temporary staffing agencies (2) experience growth of 49 percent by 2010. If numbers increase at the rate (3) , these companies will add 1.9 million new jobs by 2010. That’s more than any (4) industry.
Temporary workers were the first ones to be affected by the recent economic recession, but they are (5) to be the first to regain positions as the economy picks up and companies work to rebuild. Employers use temporary workers as a resource because (6) offer
flexibility and come at a low cost. Many temporaries are categorized as "independent contractors" instead of employees, (7) allows the employer to avoid (8) certain taxes. Because they are not required to offer benefits to temporary workers, companies can save a great deal of money by hiring temps. Usually, temporary workers can qualify (9) benefits if they work for a staffing company for a certain length of time. Most temps, however, do not continue with one company long (10) to qualify for them because they regard the position as a step on the ladder to a (11) position later.
According to Richard Wahlquist, president of the American Staffing Association, 75 (12) of temporary workers hope for transition out of the temporary staffing category (13) a period of time. Wahlquist finds that temporary workers spend about 11 weeks on various assignments before their (14) out of the temporary workforce. Many use temporary positions to gain experience and skills (15) they move on to better jobs. Wahquist says that the temp workforce as a whole turns (16) 400 percent each year.
Tom Dilworth, research director at the Employment Policies Institute, explains (17) some workers like having temporary jobs (18) it affords them a great deal of elasticity with time and everything. Some temps only have a limited (19) of time to work and temp agencies can help coordinate jobs to fit their schedules. Other sometimes-employees use temporary jobs to get an (20) to a company from the inside, to get a foot in the door of a certain business or career. (21) others take temporary positions in hopes their employers will change them over to permanent positions eventually.
Nearly all the industries in the United States use temporary workers. (22) to Tim Costello, coordinator of the North American Alliance for Fair Employment, the growth of temporary labor threatens (23) job security of permanent workers who fear replacement,as well as the temps who are more accustomed to turnover. He predicts that there will continueto (24) a gradual shift from permanent employees to contingent staffing, and that such a (25) in workplace demographics will "lead to lower wages, poorer working conditions, and more instability."

以下属于特种设备的是( )。

A．压力容器

B．起重机械

C．电梯

D．锅炉

E．冰箱

某单CPU的计算机系统采用可抢占优先级的任务调度方案，且所有任务可以并行使用I/O通道。内存中有A1、A2两个任务，按照A1、A2的次序运行，其内部计算和I/O操作时间如表1-1所示。
表1-1 可抢占优先级的任务调度表

任务	优先级	每个任务独立运行时所需的时间及过程
A1	高	计算30ms→I/O 40ms→计算20ms
A2	低	计算60ms→I/O 60ms→计算30ms

若调度程序的执行时间忽略不计，按多道程序运行方式完成这两个任务比按单道程序运行方式节省的时间是 (26) 。

A．40ms

B．60ms

C．100ms

D．200ms