皮皮学，免费搜题
登录
搜题
【单选题】
横截面为b×h的矩形截面所示,已知:h=2b=5.2cm,F=1kN,q=1kN/m,材料的应力为[ ]=140 MPa。则该梁受到的最大正应力为( )。A.
120.8MPa
B.
98.2MPa
C.
130.6MPa
D.
233.6MPa
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Every year _______ of trees are planted on the hills to protect the environment. [ ]
A.
a thousand
B.
thousands
C.
thousand
【单选题】Now that the forest was destroyed by a big fire, a large ________of trees ______ to be planted on the mountain．
A.
number; has
B.
quantity; has
C.
amount; have
D.
sum; have
相关题目：