接弹性理论，四边支承板在满足下列()项条件时应按双向板设计。

• A.<img src="https://timg.fentiku.com/img/2018-04-09/5acae0b426520.png" alt="" />
• B.<img src="https://timg.fentiku.com/img/2018-04-09/5acae0b453002.png" alt="" />
• C.<img src="https://timg.fentiku.com/img/2018-04-09/5acae0b4708b1.png" alt="" />
• D.<img src="https://timg.fentiku.com/img/2018-04-09/5acae0b491429.png" alt="" />

正确答案：B