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当发电机输出电压高于蓄电池电压，一般发电机的转速达到1000r/min左右时，励磁电流便由发电机自身供给，这种励磁方式称为（）。
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【简答题】Federal Child Labor Standards for agers age labor in the United States Federal Law sets child labor standards affecting age workers in the private companies and in federal, state, and loca...
【单选题】According to the International Labor Organization, labor standards need to be “international” because:
A.
the establishment of fair and equitable international labor standards helps promote world peace.
B.
the establishment of internationally uniform labor standards is a matter of both justice and humanity.
C.
only internationally effective standards will keep multinational companies from practicing “social dumping.”
D.
All of the above.
【单选题】Labor standards in trade are typically opposed by most developing countries who believe that they will be used
A.
To further neo-imperialist colonial exploitation.
B.
To charge these countries with crimes against child-labor standards at the Hague.
C.
As a protectionist tool by import-competing producers in industrial countries.
D.
As a means of spreading U.S. Corporate Values and destroying local cultures.
【单选题】在光滑水平面上,有一轻弹簧,其一端固定,另一端连接一质量 m =1 kg 的滑块.弹簧自然长度 l 0 =0.4 m ,倔强系数 k =900 N × m - 1 .设 t =0 时,弹簧长度为 l 0 ,滑块速度大小 v 0 =5 m × s - 1 ,速度方向与弹簧垂直.在某一时刻,弹簧长度 l =0.5 m .则该时刻滑块速度方向与弹簧长度方向间的夹角为
A.
30 °
B.
45 °
C.
60 °
D.
90 °
【单选题】如图所示，一直杆倾斜固定，并与水平方向成30°的夹角；直杆上套有一个质量为0.5kg的圆环，圆环与轻弹簧相连，在轻弹簧上端施加一竖直向上，大小F=7N的力，圆环处于静止状态，已知直杆与圆环之间的动摩擦因数为0.7，g=l0m／s 2 。下列说法正确的是（）
A.
圆环受到直杆的弹力，方向垂直直杆向上
B.
圆环受到直杆的摩擦力，方向沿直杆向上
C.
圆环受到直杆的摩擦力大小等于1N
D.
圆环受到直杆的弹力大小等于 N
【多选题】【2013-79】用赢得值法进行成本控制,其基本参数有( )。
A.
已完工作预算费用
B.
计划工作预算费用
C.
已完成工作实际费用
D.
计划工作实际费用
E.
费用绩效指数
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