According to the passage, the difference between a gas and a liquid under normal conditions on Earth is that the liquid ______.
A. is affected by changes in pressure
B. has a permanent structure
C. forms a free surface
D. is considerably more common
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表达式y=(13>1215:6>78:9)的值为____________ 。
A. 9
B. 8
C. 15
D. 1
Laser-dopple radar ______.
A. measures the movement of a spaceship by means of light beam
B. makes use of microwaves
C. makes use of sound waves
D. both A and B
为保障住房售后的维修管理，维护住房产权人和使用人的共同利益，建设部、财政部于( )年11月印发了《住宅共用部位共用设施设备维修基金管理办法》。
A. 1995
B. 1996
C. 1997
D. 1998
某黄疸病人，其尿胆原试验强阳性，尿胆红素试验阴性，酸溶血试验阳性，应考虑( )
A. 阵发性寒冷性血红蛋白尿
B. 阵发性睡眠性血红蛋白尿
C. 急性黄疸性肝炎
D. 慢性活动性肝炎
E. 胆囊炎
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