当基础受竖向力N和弯矩M共同作用时，其最大压应力应满足（）。

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问题单项选择题

A.p≤[f_a]

B.p_max≤[f_a]

C.p≤γ_a[f_a]

D.p_max≤γ_a[f_a]

答案

参考答案：D

选择题

—Is there any possible way to help them get rid of such a bad habit?

—To tell the truth, it’s very hard. But we ________ on this problem, trying to improve the situation .

A．worked

B．had worked

C．are working

D．had been working

判断题

在幼儿进行游戏活动时，教师千万不要干扰其活动，否则会限制幼儿积极性和创造性的发挥。