法的最终决定因素是（）。 A.统治阶级意志 B.国家意志 C.物质生活条件 D.历史

乳癌淋巴转移的最常见部位为（）

A.腋窝

B.锁骨下

C.锁骨上

D.胸骨旁

E.肺

利用打点计时器和如图甲所示的其他器材可以开展多项实验探究，其主要步骤如下：  

a．按装置安装好器材并连好电路  

b．接通电源，释放纸带，让重锤由静止开始自由下落  

c．关闭电源，取出纸带，更换纸带，重复步骤b，打出几条纸带  

d．选择一条符合实验要求的纸带，数据如图乙(相邻计数点的时间为T)，进行数据处理   

   

(1)若是探究重力做功和物体动能的变化的关系。需求出重锤运动到各计数点的瞬时速度，试表示在B点时重锤运动的瞬时速度v_B=___________。  

(2)若是测量重力加速度g。为减少实验的偶然误差，采用逐差法处理数据，则加速度大小可以表示为g=___________。  

(3)如果求出的加速度值与当地重力加速度公认的值g'有较大差距，说明实验过程存在较大的阻力，若要测出阻力的大小，则还需测量的物理量是___________。试用这些物理量和纸带上的数据符号表示出重锤在下落的过程中受到的平均阻力大小F=___________。

在一月份哪个地区的日照时间长？

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. Wahlquist 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 continue to______(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."

（）图像格式支持二值图像模式下透明白色。

A.JPEG

B.TIFF

C.EPS

D.BMP