以下哪类土的工程性质较差,不可直接采用作为路基填土,必须换土或处理。()
A.砂土
B.砂性土
C.粉性土
D.粘性土
参考答案:D
Many people don't know what to do when _____ with real danger. [ ]
A. facing
B. being faced
C. to face
D. faced
当已规定了要求工期Tr时,网络计划的计划工期( )。
A.Tp=Tr
B.Tp≤Tr
C.Tp≥Tr
D.Tp<Tr