如果空调系统的低压和高压侧压力都太高，感觉低压管路是热的，可能的原因是（）。 制冷剂过量。 制冷剂不足。 制冷剂中有空气。 制冷剂中有水分。
泰曼温度
What are two characteristics of dual-ring interconnect in SONET networks? （）(Choose two.) It protects signals against node failures between rings.。 It protects signals against node failure within a single ring.。 It allows for traffic to be preempted when a ring switch occurs.。 Traffic can be dropped and continued at interconnecting nodes.。 It protects preemptible traffic from being dropped when a ring switch occurs.。
Given： What is the result？（） r， t， t，。 r， e， o，。 Compilation fails.。 An exception is thrown at runtime.。
公路路面保洁工作不属于公路小修保养的工作内容。
When a valid SQL Query in a DB Read step returns 0 rows, which branch of the step will be executed? （）
