吊箱围堰封底厚度应根据抽水时吊箱不上浮的原则计算确定。封底厚度不宜小于（）。
参考答案：1.0m
When she came several days later, she found that all things still _______ where she had _______ them.
A．lay; laid
B．laid; lied
C．lay; lain
D．lying; lain
下列______键不属于二态转换键。
A．Caps Lock
B．Num Lock
C．Del
D．Ins
