甲醇合成系统长期停车,在停止循环压缩机时,合成系统应完成系统()合格操作
参考答案:氮气置换
His first book ______ next month is based on a true story.
A.published
B.to be published
C.to publish
D.being published
患者,男,60岁,右肢体功能障碍2小时,CT平扫正常。24小时后复查,左颞叶大片模糊低密度,诊断为()。
A.左颈内动脉支配区急性脑梗塞
B.前交通动脉支配区急性脑梗塞
C.左大脑中动脉支配区急性颞叶脑梗塞
D.左大脑前动脉支配区急性颞叶脑梗塞
E.左大脑后动脉支配区急性颞叶脑梗塞