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【判断题】
正温度系数（PTC）型热敏电阻，特性曲线随温度升高也增大，其色标记为白色，负温度系数（NTC）型半导体热敏电阻是应用最广泛的热敏电阻之一，其色标记为绿色。A.
正确
B.
错误
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【简答题】Employers decide to create a(n) ________ (vacant) only when the expected profit of a filled job exceeds the hiring costs for a new employee.
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【简答题】提速道岔扣件采用( )弹条分开式可调扣件。
【简答题】Employers decide to create a ( n )______ only when the expected profit of a filled o job exceeds the hiring costs for a new employee.
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