[多项选择]( )装置外壳导电部分可作为保护导体。 A. 无论是从结构上或是从适当连接上它们的电气连续性都必须得到确实保证,使之不受机械的或化学的损蚀 B. 它们的导电性能必须满足热稳定校验 C. 除非装有补偿措施,否则必须采取措施防止它们移动 D. 它们已经被考虑作为这种用途,并且如果需要已适当加以修改
第18题: [单项选择]{{B}} Passage One
Questions 26 to 28 are based on the passage you have just heard.{{/B}} A. In the mid-1980s. B. In the mid-1960s. C. In the mid-1970s. D. In the mid-1990s. 参考答案:D 答案解析:[听力原文]26-28
The Spice Girls were an amazingly successful singing group which rose to the top of