各邮区中心局之间邮件接卸签收应利用清单点数办理交接,点验完毕后办理签收手续。
参考答案:错
"I'm more nervous right now than when I ______," Jane said, as she saw the group of reporters waiting anxiously at the exit of the gym.
A.had competed
B.compete
C.was competing
D.have competed
对于一个静定桁架结构,如果其中一根杆元件的横截面面积增大一倍,其它条件不变,则这根杆元件的内力()。
A.增大
B.不变
C.减小
D.无法确定,不同的结构有不同的结果