问题
选择题
Some measures are needed to _____ the farmland against shifting sand. [ ]
A. seek
B. stimulate
C. shape
D. secure
答案
答案：D
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Some measures are needed to _____ the farmland against shifting sand. [ ]
A. seek
B. stimulate
C. shape
D. secure
答案：D
，则当地基中某点的大主应力σ1=450kPa，而小主应力σ3为（）时，该点刚好发生剪切破坏。