题目内容

A bilingual secretary(Line 4，paragraph 3)differs from other secretaries in that he or she call＿＿＿．

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When the mixture is used，it is important to＿＿＿．

He told me that I＿＿＿be present at the meeting．

What is David going to do？

有一桁架，受力及支承如下图所示，则AC杆和AB杆的内力分别为（）kN。(拉力为正，压力为负)

A. -1，-1
B. 0，-1
C. 1，1
D. 1，0