采用天然地基提供反力时，施加于地基的压应力至少为地基承载力特征值的（）倍。
参考答案：1.5
句型转换，一空一词。
1. Frank has a new watch and a nice bike. (改为否定句)
Frank ______ ______ a new watch ______ a nice bike.
2. What are your parents' jobs?(改为同义句)
______ ______your parents ______ ?
3. My brother want to be a soccer player. (就画线部分提问)
______ ______your brother want to be?
4. It's windy in Wuhan.(就画线部分提问)
______ the ______in Wuhan?
5. Tom often gets to school early. (用现在进行时改写)
Tom ______ ______ to school early.
元流
