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为什么煤仓上口应设坚固的栅栏?

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简述农业资源与环境保护的基本制度。

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。

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

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