Is it normal to not use abbreviation for titles in Mainland China?
习总/習總 we say all the time (as someone pointed out, using this expression means a president of a company whose last name is Xi, not Xi Jinping). Similarly, you can say last name + 总, and it is acceptable for referring to a person or when calling them by name like &quot;吴总，你好！“ (Hello, Mr Wu!) To your question, although it would not be weird if you don't use this abbreviation, it is very commonly used and saying &quot;总裁/總裁&quot; in full sounds too formal in most situations.
任队/任隊 some people do say, but most people would not abbreviate it. It is the kind of thing that policemen or firemen would call their superior. You don't have to use this abbreviation at all in mainland.
郎教 for Lang Ping specifically we do use that abbreviation for her sometimes, but we don't abbreviate for coaches in general. It is not a common usage. You shouldn't use this abbreviation in most circumstances.
王官 and 张状/張狀 we do not say at all. The first one is just an abbreviation that Mandarin speakers would not use. The second one is pure Cantonese. &quot;状/狀&quot; or &quot;大状/大狀&quot; are Cantonese words. In Mandarin, we would just say &quot;张律师/張律師&quot;. It is also worth mentioning that the concepts of solicitors (律师/律師) and barristers (大律师/大律師) are not in the Mainland legal system, because we are not a common law jurisdiction.