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【单选题】
三角托架受力如图所示,设1、2两杆的变形分别是 Δl 1 (伸长)和 Δl 2 (缩短),则节点B的水平位移 δ x 和铅垂位移 δ y 分别为( )。A.
δ x = Δ l 1 ， δ y = Δ l 2 sin α
B.
δ x = Δl 1 ， δ y = Δl 2 /sin α
C.
δ x = Δ l 1 ， δ y = Δ l 1 cot α + Δ l 2 /sin α
D.
δ x =0， δ y = Δ l 1 cot α + Δ l 2 /cos α
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【简答题】在计算机领域中，媒体是指（ ）。
【简答题】As a single mother，I had to do two jobs，which kept me very busy. Two months ago，I went to a _36__ with Alice. Since I __37__went out with her，she seemed very happy. Many parents were there with their ...
【简答题】As a single mother，I had to do two jobs，which kept me very busy. Two months ago，I went to a ____ with Alice. Since I ____ went out with her，she seemed very happy. Many parents were there with their ch...
【单选题】听力原文：M：Oh，I am so angry．My wife hasn't been speaking any word with me．I am so busy with my work that I forgot her birthday． W：I will be the same if I were your wife．If you can not keep it in mind，you ...
A.
His wife should excuse him.
B.
His wife has no reason to do that.
C.
He should have remembered it.
D.
He is right to be angry.
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