因为金属导体是电子性导电的所以当温度升高时分子活动增强，所以导电能力增强。
查看答案
Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.
A. low compression pressure
B. increased piston wear
C. increased cylinder lube oil consumption
D. poor contact between compression rings and liner
路基连续式无砟轨道，支撑层切缝时间根据支撑层材料和天气等具体情况确定，最迟不得晚于浇筑完成后（）小时。
A. 8
B. 12
C. 24
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