字段输入掩码是在给字段输入数据时设置某种特定的______。
参考答案:输入格式
“What’s her new telephone number?” “Oh, I _____.”
A.forget
B.forgot
C.had forgotten
D.am forgetting
(2012)图示结构,结点C处的弯矩是:()
A.30kN·m,上侧受拉
B.30kN·m,下侧受拉
C.45kN·m,上侧受拉
D.45kN·m,下侧受拉