T形刚构或悬臂梁挂孔的预制挂梁通过悬臂梁段架设时，应验算悬臂梁段的强度及（）。
参考答案：稳定性
—I called you last night, but nobody answered.
—I ______ dinner with my family in the restaurant.[ ]
A. have
B. had
C. have had
D. was having
谈判中，是否应研究对方的手势？（）
A.有时研究
B.经常注意
C.没空研究
D.很少注意
