丁先生，30岁，严重挤压伤住院，入院后病情进行性恶化，第2日神志不清。血压80／60mmHg，尿量24h约500ml，护士血标本时，发现血液黏稠易凝固。该病人可能并发
A、弥散性血管内凝血(DIC)
B、败血症
C、感染性休克
D、急性肾衰竭
E、心功能不全

单项选择题在某参照系中用玩具枪发射子弹击中远处的气球，使气球破裂，按照洛伦兹变换，可能存在另一个参照系，观察到气球破裂发生在枪发射子弹之前. ( )A.对B.错

单项选择题PQS Ltd plans to sell 1,800 units of product DR next year. Opening stock of DR is budgeted to be 150 units and PQS Ltd budgets to reduce stock by ten percent by the end of the year. How many units of product DR should be produced next year?