业务恢复时限指针对影响客户业务正常使用的故障,自客户提出()时或出现()时起,至故障排除或采取其他方式恢复用户正常业务所需要的时间。
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铅酸蓄电池在使用中容量下降的原因有()。
A. 长期充电不足
B. 电解液干涸
C. 电池内部微短路
In a two-stroke engine, there are always a series of openings known as (), and in some circumstances, there are also openings known as (), in the part of the cylinder liner.
A. scavenging air ports;exhaust ports
B. inlet ports;scavenging air ports
C. scavenging air ports;inlet ports
D. exhaust ports;inlet port
通常由合成得到的高分子都是()的高聚物
A. 相对分子质量相同
B. 热固性
C. 多分散性
D. 线型