研究地球内部物质的各种间接手段和依据中（）提供的信息最为重要。
参考答案：地震波
----Guess what ! I came across a friend at the party last night.
---- ________. I am sure you had a wonderful time.
A．Sounds good!
B．Very well.
C．How nice !
D．All right.
铺脚手板时，必须按照脚手架的宽度铺满，板要垫平铺稳挤严，板与墙面的空隙不大于（）。
A.10C.m
B.20C.m
C.30C.m
