1.Low suction pressure in a compressor is unlikely caused by:
1.压缩机吸气压力过低，不太可能是由以下哪项原因引起的：
2.An overheating electric motor is not caused by:
2.电动机过热，不是由以下哪项原因引起的：
3.Common electrical motor issues include:
3.常见的电动机故障包括：
4.High head pressure in an air-cooled condenser often results from:
4.风冷式冷凝器排气压力过高，通常是由于以下哪项原因造成的：
5.Maintenance of cooling towers and coils often involves solvents and ______.
5.冷却塔和盘管的维护工作通常涉及使用溶剂和 ______。
6.LP gas is hazardous because:
6.液化石油气（LP gas）具有危险性，是因为：
7.A compressor that short-cycles may be caused by:
7.压缩机出现频繁启停（短周期运行）的故障，可能是由以下哪项原因引起的：
8.A compressor that does not start (no hum) could be caused by:
8.压缩机无法启动（且无嗡嗡声），可能是由以下哪项原因引起的：
9.A compressor running continuously may be due to:
9.压缩机持续不停机运行，可能是由于以下哪项原因造成的：
10.If black soot is observed around HVAC supply or return registers, what should be the technician’s first action?
10.如果在暖通空调（HVAC）系统的送风口或回风口周围发现黑色烟灰，技术人员首先应采取什么措施？
