次梁的截面高度一般为跨度的1/20~1/15,梁宽为梁高的()。
A.1/3~1/2
B.1/4~1/2
C.1/4~1/12
D.1/8~1/12
参考答案:A
Instead of sending e-mail, Nancy talks with her mother on mobile phone once a week.
A.the; a
B.an; the
C.an; /
D.the; an