TOP Chinese and British negotiators called a truce, at least temporarily, and put on a friendlier atmosphere at the opening yesterday of the sixth round of talks on the 1994/95 electoral arrangements. The three-day talks follow an escalation in the war of words between the two sides in the past week, with each accusing the other of lacking sincerity. Speaking before the meeting at the Diaoyutai state guesthouse, Chinese team leader Jiang Enzhu said the pace of talks could be accelerated if both sides had determination and resilience. He was referring to repeated calls by the British side for more progress. China has been accusing the British of lacking sincerity in striking a deal. Mr Jiang, a Deputy Foreign Minister, declined to comment on how talks would proceed. ''We won't hold talks or argue in front of reporters,'' he said. But Mr Jiang admitted it was not easy to produce positive results. ''The talks are like climbing a high mountain. It's no easy task, but, if we work hard, we can reach the top,'' he said. Britain's ambassador to China, Sir Robin McLaren, said it was important for both sides to consider each other's opinions. ''So long as we show ourselves to be positive and constructive, and consider each other's ideas, I'm sure we should be able to make progress,'' he said. But after emerging from the three-hour session, Sir Robin told reporters that they could judge from the atmosphere during the photo call that some media reports were ''far from the mark''. ''We have had a perfectly normal discussion.'' Mr Jiang would not comment on a planned British cabinet meeting to be held in London next week to review progress of the talks. ''It's a matter for the British side,'' he said.