直方图的纵坐标是表示（）。A．频数 B．原因变量 C．质量特性值 D．样本号

已知△ABC的三个顶点分别为A（-2，3）、B（-4，-1）、C（2，0），现将△ABC平移至△A′B′C′处，且A′坐标为（-1，2），则B′、C′点的坐标分别为______．

手术切口设计中错误的是

A．牙周组织的健康程度影响愈合

B．切口下方必须有骨组织支持

C．瓣膜蒂可小于游离端

D．切口不应通过骨隆突

E．切口边缘不能被撕裂

下列图示实验操作中，正确的是（　　）

A．

    给液体加热

B．

   闻气体气味

C．

    读取液体体积

D．

    熄灭酒精灯

下面短文有10处语言错误，请在有错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号（＾）.并在其下面写出该加的词。

删除：把多余的词用斜线(\)划掉，

修改：在错的词下划一横线，在该行右边横线上写出改正后的词。

注意：1.每处错误及其修改均仅限一词.

2.只允许修改10处，多者（从第11处起）不计分

Two years before, I traveled to Brazil and 1 rented for a car. Unfortunate, 1 had an accident and hit another car, and I needed to stay in a hospital for at least two week. I called my parents, so 1 did not tell them what had happened. I knew that they will be worried about myself because I was so farther away, and that my mother would not sleep if she knew. Therefore, I told them interested stories and how 1 was enjoying Brazil. As a result, nobody knew truth. I still think that it was the right thing to do.

通过旺旺我可以直接对要上传的图片进行编辑处理。（）