In the construction of artificial digging hole filling pile, the breast wall shall ( ).
A.
Flush with the ground
B.
100mm below the ground
C.
200mm above the ground
D.
300mm above the ground
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参考答案:
举一反三
【简答题】Apart from academic activities, what else will the foreign students do in this program? They will take ______ and short journeys in and around Beijing.