如图是动物某分泌细胞．向细胞内注射用放射性同位素³H标记的氨基酸，一段时间后，在细胞外检测到含有放射性的分泌蛋白质．请回答下列问题（内填序号）：

（1）请举例写出3种分泌蛋白质：____、____、____ ．

（2）标记氨基酸的放射性同位素³H将依次经过各细胞结构，它们依次是图中____ ．（用序号和箭头来表示）

（3）⑥的分泌蛋白质首先是由附着在____ 上的____ 合成的．

（4）图中显示了各种膜结构之间可以相互转化，细胞内各类膜在组成和结构上是____ （填“完全相同的”或“相似的”）

若多项式x²+kx﹣6有一个因式是（x﹣2），则k=____ 

下列二次根式中能与 合并的二次根式是（　　）.

    Last year Jeff left school. He came to Guangzhou to find a 1. He went to one company after another company. But no one wanted him. Then he had 2 money. He had to go back to his small town. 3 he came to the station. He 4 very sad and tired. It was very late at night and the station was 5 of people. They were waiting to buy tickets of the last train. He bought the 6 ticket, so he was very happy.

    At that time, a woman 7 a crying baby walked to him. She asked him to 8 her the ticket. He gave her the ticket. He thought they needed it more than he. After the train left, he sat on the bench and didn't know 9 to go. Just then an old man came and said, "Young man, I saw what you did to help the woman. I have a big company. I need a good young man like you. Would you like to 10for me?"

在一幅长80厘米，宽50厘米的矩形风景画的四周镶一条金色的纸边，制成一幅矩形挂图，如图，如果要使整个挂图的面积是5400平方厘米，设金色纸边的宽为x厘米，那么满足的方程是（　　）