中国诗歌史上最古老的弃妇诗是（）。
A.《周南•汉广》
B.《卫风•氓》
C.《郑风•将仲子》
D.《郑风•狡童》
参考答案：B
钢筋混凝土次梁的截面高度一般为其跨度的（）
A、1/10-1/12
B、1/12-1/18
C、1/18-1/25
D、1/25-1/25
This is a . There is a on it.
He his to his friends and family.
She puts the under the Christmas . 
At Christmas, we have , and .