One day some of Bill's friends saw ______ in his garden.
A. a very big piece of wood
B. a very nice target
C. a hole
D. a very beautiful picture
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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
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
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