一根铁丝长a米,用去5米,剩下______米.
a-5(米),
答:剩下a-5米;
故答案为:a-5.
Jane to carry heavy things. She is very strong. [ ]
A. can
B. able
C. is able
D. could
基坑开挖后,坑内外水位形成水位差,当坑底潜水浮托力超过坑底上覆土重及其抗剪强度时,有可能形成( )。
A.流土
B.流砂
C.管涌
D.突涌