温度为0℃的物体 ____内能．（选填“有”或“没有”）

看句子，连线。

① How is your mother? ____     A. You are welcome.

② Thank you.____            B. No, I haven't.

③ Have you got enough food?____    C. I was in Shanghai.

④ What did you do lastSunday?____  D. We watched TV at home.

⑤ Where were you two daysago?____  E. Sheis very well.

给出下列命题：

①存在实数x，使得sinx+cosx=$\frac{3}{2}$；

②函数y=2sin（2x+$\frac{\mathrm{\pi }}{3}$）的图象关于点（$\frac{\mathrm{\pi }}{12}$，0）对称；

③若函数f（x）=ksinx+cosx的图象关于点（$\frac{\mathrm{\pi }}{4}$，0）对称，则k=﹣1；

④在平行四边形ABCD中，若|$\overrightarrow{BC}$+$\overrightarrow{BA}$|=|$\overrightarrow{BC}$+$\overrightarrow{AB}$|，则四边形ABCD的形状一定是矩形．

则其中正确的序号是____ （将正确的判断的序号都填上）

下列所使用的试剂必需现配现用的是
①斐林试剂     ②二苯胺试剂      ③双缩脲试剂      ④龙胆紫