灌堵缝口时，用干细（）由缝口灌入，再用钢筋或钢棍捣实。
A.沙子
B.沙壤土
C.沙土
D.黏土
参考答案：B
皮带秤中控累计量，故障原因及处理方法？
It snowed heavily last night and we had to use thick sticks to _____ the roof of the hut. [ ]
A. hold on
B. hold up
C. hold back
D. hold out
