正确答案: A

①②③

题目：化学品酸的腐蚀性，取决于()。①浓度②PH值③温度

解析：A

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举一反三的答案和解析：

[单选题]下列哪些情况下船舶应以安全航速行驶？I、将要靠码头的船舶；II、刚起锚欲驶往航道的船舶；III、从事使其驶离航向的能力严重受到限制的作业的船舶

I、II、III

[单选题]Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as _______.

compensation

[单选题]在机舱发生火灾时_________是现场指挥。

轮机长