能供给锅炉的水有（）和（）。

某高强度钢，材料的屈服极限为400MPa，强度极限为500MPa，断裂极限为480MPa，比例极限为320MPa，设计安全系数为5，若用此材质的圆钢承受Q=6．5×10⁴N的拉伸载荷，试问圆钢的直径至少要多少才能满足使用要求？

( )是证券法律制度的核心任务。

A．保证证券发行人能够筹集到所需资金

B．保证证券交易价格的稳定

C．促进证券经营机构的不断壮大

D．保护公众投资者的合法权利

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

怀疑有胸、腰、椎骨折的病人，搬运时，可以采用一人抬头，一人抬腿的方法。

为提高雷达测量精度，选择量程时应使回波显示在：（）

A、荧光屏边缘

B、靠近屏中心附近

C、约1/2—2/3屏半径附近

D、ABC均可