题目内容

We’re going to________ the task that we haven’t finished.

A. keep up
B. carry on
C. take away
D. set up

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The general manager sat there, ________to the report from each department.

A. listen
B. to listen
C. was listened
D. listening

Because light travels (fast) ________than sound, lighting is seen before thunder (雷) is heard.

截面设计时，满足下列条件（）则为第二类T形截面。

A. fyAs ≤fcm b'f h'f
B. M ≤fcm b'f h'f(ho-h'f /2)
C. fyAs >fcm b'f h'f
D. M >fcm b'f h'f(ho-h'f /2)

已知T形截面梁，b=250mm，h=600mm，h'f =100mm，b'f =800mm。截面承受的弯矩设计值M=500kN·m。混凝土为C20级（fcm=11N/m2），纵筋为Ⅱ级钢(fy =310N/mm2，αs,max =0.396, ξb=0.544)，求梁的纵向受拉钢筋As(假定受拉钢筋按两排布置)。