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装设接地线必须先接地端，后接导体端。拆地线的顺序则刚好相反。装拆接地线均应使用绝缘棒并戴绝缘手套。( )

A. 对
B. 错

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直肠的良性肿瘤多呈（）

A. 结节状
B. 分叶状
C. 息肉状
D. 乳头状
E. 囊状

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C Unemployment (失业) rose from 7.5% in June, 1996 to 7.8% in July, 1996, the highest rate since January of that year, the Labor Department reported. The main reason was a large increase—nearly 700,000 in the labor force, with a record 61.9% of the population over sixteen years of age working or actively looking for work. That growth was caused mainly by an increase in the number of women in the labor force, an increase partly because of a continuation of long-term and economic trends (经济趋势)and partly a reflection of pressure on families to increase their incomes. It can be inferred that the labor force described in the passage is made up of ______.

A. persons whose jobs are not professional (专业的)
B. persons who work at both permanent (永久的) and full-time jobs
C. those over 16 years of age who are looking for work
D. about 60% of the country’s population

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由于铝的储量丰富、产量大，因此铝导线使用的数量大于铜、钢的使用数量。( )

A. 对
B. 错

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由于IT系统中性点不接地或经高阻抗接地，因此当系统发生单相接地故障时，三相用电设备及接线电压的单相用电设备不能继续运行。( )

A. 对
B. 错

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装设接地线必须先接地端，后接导体端。拆地线的顺序则刚好相反。装拆接地线均应使用绝缘棒并戴绝缘手套。( )

A. 对 B. 错

直肠的良性肿瘤多呈（）

由于铝的储量丰富、产量大，因此铝导线使用的数量大于铜、钢的使用数量。( )

由于IT系统中性点不接地或经高阻抗接地，因此当系统发生单相接地故障时，三相用电设备及接线电压的单相用电设备不能继续运行。( )

A. 对
B. 错