题目内容
分层空调的气流组织设计，空调区宜采用（ ）。
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Listen to the passage and fill in the blanks with the words you hear. Hong Kong Unemployment Rate Rises to 5%Hong Kong’s seasonally adjusted unemployment rate increased from 4.6% in January 2009 to 5% in February 2009, according to 1) carried out by the Census and Statistics Department of the Hong Kong Special Administrative Region Government.The increases in the unemployment rate were mainly seen in the construction, 2) import and export trades,manufacturing and restaurants sectors. As to the 3)rate, decreases were mainly seen in the decoration and manufacturing sectors, and amusement and recreational services sectors.In the near term, the unemployment rate is expected to 4)further, as labor demand remains weak given the economic downturn.Hong Kong Secretary for Labour and Welfare, Mr. Matthew Cheung, said that the labor market had been much affected by the financial tsunami and the 5). He stressed that the Government would continue to do its best to help the affected employees and job seekers.
短路的原因有：
下列属于短路危害的是：
短路电流计算的目的有：
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