精索静脉曲张的超声特征是：（） A.右侧精索静脉曲张达2mm，彩色多普勒血流显像显示

对实验进行改进是创新的表现方式之一。下图是某研究性学习小组设计的几种装置，请你分析并回答下列问题：

（1）A装置中所用玻璃仪器的名称是__________；

（2）A装置除可用作实验室制取H₂、O₂的发生器外，还可以用作制______气体的发生装置，用A装置制取O₂的化学方程式是_______________________；

（3）小张从装置A得到启发，在大试管中增加了隔离铜丝网，设计成装置B用于制H₂，相对于用A装置制H₂，用B装置的优点是_____________________________；

（4）小李回家用大小不同的两只试管设计了C、D装置，准备用于制取少量H₂，你认为C、D装置中哪一种装置更好______（填字母代号）。小李从家中找出了废旧干电池皮（含单质锌）、牙膏皮（含单质铝），稀硫酸、食醋，用于制H₂的最佳化学反应方程式是___________________________。

算法的时间复杂度是指 ( )

A．执行算法程序所需要的时间

B．算法程序的长度

C．算法执行过程中所需要的基本运算次数

D．算法程序中的指令条数

阅读理解。

     Eddie's father used to say he'd spent so many years by the ocean, breathing seawater. Now, away from

that ocean, in the hospital bed, his body began to look like a beached fish. His condition went from fair to

stable and from stable to serious. Friends went from saying, "He'll be home in a day," to "He'll be home in

a week" In his father's absence, Eddie helped out at the pier (码头), working evenings after his taxi job.

     When Eddie was a teenager, if he ever complained or seemed bored with the pier, his father would shout,

"What? This isn't good enough for you?" And later, when he'd suggested Eddie take a job there after high

school, Eddie almost laughed, and his father again said, "What? This isn't good enough for you?" And before

Eddie went to war, when he'd talked of marrying Marguerite and becoming an engineer, his father said,

"What? This isn't good enough for you?"

     And now, regardless of all that, here he was, at the pier, doing his father's labor.

     Parents rarely let go of their children, so children let go of them. They move on They move away. It is

not until much later, as the heart weakens, that children understand: their stories, and all their accomplishments,

sit on top of the stories of their mothers and fathers, stones upon stones, beneath the waters of their lives. 

     Finally, one night, at his mother's urging, Eddie visited the hospital. He entered the room slowly. His father,

who for years had refused to speak to Eddie, now lacked the strength to even try.

     "Don't sweat it, kid," the other workers told him "Your old man will pull through. He's the toughest man

we've ever seen."

     When the news came that his father had died, Eddie felt the emptiest kind of anger, the kind that circles

in its cage.

     In the weeks that followed, Eddie's mother lived in a confused state. She spoke to her husband as if he

were still there. She yelled at him to turn down the radio. She cooked enough food for two. One night, when

Eddie offered to help with'the dishes, she said, "Your father will put them away." Eddie put a hand on her

shoulder. "Ma," he said, softly, "Dad's gone."

     "Gone where?"

1. In Paragraph 4, the writer indicates that _____. [ ]

A. Children like moving away from their parents

B. Children often feel regretful because they leave their parents

C. Children wouldn't have achieved so much without their parents' support

D. Children can never understand how much their parents have devoted to them

2. The underlined sentence probably means "_____". [ ]

A. Don't give it up 

B. Don't worry about it

C. Don't let him down

D. Don't touch it

3. Which of the following shows the right order of the story?

    a. Eddie's father died.

    b. Eddie worked as a taxi driver.

    c. Eddie married Marguerite.

    d. Eddie was bored with his father's job. [ ]

A. bacd

B. dcab

C. bcda

D. dcba

4. From the last part of the passage, we learn that _____. [ ]

A. Eddie's mother liked to listen to the radio

B. Eddie often helped his mother wash the dishes

C. Eddie and his wife lived in his mother's apartment

D. Eddie's mother missed her husband so much that she was at a loss

下面哪项是电子邮件系统的优点？（）

A.较其他信息传递方法更具有性价比

B.比手工系统更容易操作

C.实施便宜

D.可以让任何想使用系统的人使用

接种物