These houses are offered for sale at _________ prices.
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Regular __________is very important if you want to keep this machine in good order.
Before boarding the airplane, you have to check in ________ luggage over there.
He wanted to travel to Beijing in the most __________ way.
土中某点处于剪切破坏时，破坏面与小主应力作用面间的夹角是（ ）。
A. 90度+φ
B. 45度+φ/2
C. φ
D. 45度–φ/2
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