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【单选题】
Women are on the verge of outnumbering men in the workforce for the first time, a historic reversal caused by long-term changes in womens roles and massive job losses for men during this recession. Women held 49.83% of the nations 132 million jobs in June and theyre gaining the vast majority of jobs in the few sectors of the economy that are growing, according to the most recent numbers available from the Bureau of Labour Statistics. Thats a record high for a measure thats been growing steadily for decades and accelerating during the recession. At the current pace, women will become a majority of workers in October or November. "It was a long historical slog(沉重缓慢的前进)to get to this point," says labour economist Heidi Hartmann, president of the Institute for Womens Policy Research. The change reflects the growing importance of women as wage earners, but it doesnt show full equality, Hartmann says. On average, women work fewer hours than men, hold more part-time jobs and earn 77% of what men make, she says. Men also still dominate higher-paying executive ranks. Women have been a growing share of the once heavily male labour force for nearly a century, recording big bumps during epochal(划时代的)events such as the Depression and World War II. This time, the boost came from a severe recession that has been brutal(无情的)on male-dominated professions such as construction and manufacturing. The only parts of the economy still growing — health care, education and government — have traditionally hired mostly women. That dominance has increased in part because federal stimulus funding directed money to education, health care and state and local governments. The gender transformation is especially remarkable in local governments 14.6 million-person workforce. Cities, schools, water authorities and other local legal power have cut 86,000 men from payrolls during the recession — while adding 167,000 women, according to the Bureau of Labour Statistics. "Unemployment among men isnt going to last forever," says University of Chicago economist Casey Mulligan. "People will move from construction and manufacturing to industries that are creating new jobs." Mulligan expects the portion of jobs held by women to peak slightly above 50% this year, then drop below half when the economy recovers and more men find work. What does the author say about the workforce during this recession?
A.
Men make up the most profitable sectors.
B.
Women gain jobs while men lose jobs.
C.
Women take the most jobs in the economy.
D.
Women outnumber men in few sectors.
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【单选题】乙醇沉淀法一般在( )提取液中进行
A.
B.
乙醇
C.
甲醇
D.
有机溶剂
E.
以上都可以
【判断题】如果过量空气系数过小,会使q3增加。
A.
正确
B.
错误
【单选题】以下关于化学不完全燃烧热损失q3的叙述错误的为( )。
A.
负荷增加,可燃气体在炉内停留时间减少,q3增加
B.
过量空气系数过小,q3增加
C.
炉内布置水冷壁过多,温度下降,导致q3减少
D.
层燃炉燃料层过厚,CO增多,从而使q3增加
【单选题】执行下列程序段后,变量 x 的值是( )。 k = 0 Do Until k >= 3 x = x + 2 k = k + 1 Loop
A.
2
B.
4
C.
6
D.
8
【判断题】两圆柱齿轮啮合时,在垂直于圆柱齿轮轴线的投形面的视图中,啮合区内的齿顶圆可连续画出,也可中断,但分度圆必须相切。 【答案】
A.
正确
B.
错误
【单选题】若k=10;则执行下列程序后,变量k的值是_____。 switch(k) { case 9 : k++; case 10: k+=1; case 11: k+=1; break; default: k+=4; }
A.
12
B.
13
C.
14
D.
11
【单选题】在套管换热器内通过饱和蒸汽冷凝加热某一种液体,如果空气流量增加,其他条件不变,则空气出口温度 _________ ,总传热系数 K _________ ,传热速率 Q _________ 。
A.
降低,减小,不变
B.
降低,增大,增大
C.
不变,增大,增大
D.
升高,增大,增大
【单选题】乙醇沉淀法一般在下列哪种提取液中进行
A.
B.
乙醇
C.
甲醇
D.
有机溶剂
E.
以上都可以
【判断题】液压马达属于动力元件,它能把油液的液压能转化为机械能。
A.
正确
B.
错误
【单选题】在正常负荷范围内,炉膛出口过量空气系数过大,会造成()。
A.
q3降低,q4增加
B.
q2,q4f均降低
C.
q3降低,q4可能增大,q2增加
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