若给8253的计数器预置的初值=400,则当计数器计到数值为0时,时间= ____ms,设8253的计数脉冲频率为0.5MHz。
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成本分析模式是通过分析持有现金的相关成本，寻求持有成本最低的现金持有模式。（）
A. 对
B. 错
When did the Californian wine workers begin the strike ?
A. This week
B. Last week
C. Six weeks ago
D. Seven weeks ago
Why did the workers go on strike?
A. The winery owners propose to cut their wages.
B. The winery owners propose to cut their wages and benefits.
C. The winery owners propose to fire them.
D. The winery owners propose to use non-union workers.
Which of the following can be inferred from the news?
A. The harvest was severely affected by the strike.
B. The union workers are bound to win their battle against their employers.
C. The strike went ahead successfully.
D. The strike didn't seem to disturb winery owners very much.
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