如图所示,下列关于机械能是否守恒的判断正确的是(   ) A.甲图中,火箭升空

题型:选择题

问题:

如图所示,下列关于机械能是否守恒的判断正确的是(   )

A.甲图中,火箭升空的过程中,若匀速升空机械能守恒,若加速升空机械能不守恒

B.乙图中物体匀速运动,机械能守恒

C.丙图中小球做匀速圆周运动,机械能守恒

D.丁图中,轻弹簧将A、B两小车弹开,两小车组成的系统机械能不守恒,两小车和弹簧组成的系统机械能守恒

考点:机械能守恒定律
题型:选择题

硫酸-硝酸消化食品样品过程中,要维持定量的硝酸是()

A.使样品灰化

B.缩短消化时间

C.避免发生炭化还原金属

D.除去干扰杂质

E.为了消化完全

题型:选择题

B

On one of her trips to New York several years ago, Eudora Welty decided to take a couple of New York friends out to dinner. They settled in at a comfortable East Side cafe and within minutes, another customer was approaching their table.

“Hey, aren’t you from Mississippi?” the elegant, white-haired writer remembered being asked by the stranger. “I’m from Mississippi too.”

Without a second thought, the woman joined the Welty party. When her dinner partner showed up, she also pulled up a chair.

“They began telling me all the news of Mississippi,” Welty said. “I didn’t know what my New York friends were thinking.”

Taxis on a rainy New York night are rarer than sunshine. By the time the group got up to leave, it was pouring outside. Welty’s new friends immediately sent a waiter to find a cab. Heading back downtown toward her hotel, her big-city friends were amazed at the turn of events that had changed their Big Apple dinner into a Mississippi.

“My friends said: ‘Now we believe your stories,’” Welty added. “And I said: ‘Now you know. These are the people that make me write them.’”

Sitting on a sofa in her room, Welty, a slim figure in a simple gray dress, looked pleased with this explanation.

“I don’t make them up,” she said of the characters in her fiction these last 50 or so years. “I don’t have to.”

Beauticians, bartenders, piano players and people with purple hats, Welty’s people come from afternoons spent visiting with old friends, from walks through the streets of her native Jackson, Miss., from conversations overheard on a bus. It annoys Welty that, at 78, her left ear has now given out. Sometimes, sitting on a bus or a train, she hears only a fragment(片段) of a particularly interesting story.

What can we learn about the characters in Welty’s fiction?()

A. They live in big cities.

B. They are mostly women.

C. They come from real life.

D. They are pleasure seekers.

题型:选择题

信托受益权进行拆分转让的,受让人不得为法人。

题型:选择题

Please have the damage to the gangway().

A.repair

B.to repair

C.repairing

D.repaired

题型:选择题

甲每天开车上班,乙公司与甲在劳动合同中约定了开车路线,明确规定只有在该路段发生车祸受伤才能认定为工伤。其实,甲每天上班前还开车送妻子上班,虽然不顺路,但绕道10公里左右,也不算太远。一天,甲在送妻子途中发生严重车祸,甲和妻子都严重受伤。交警认定对方车辆全责。甲和妻子分别要求单位申请工伤认定,但都遭到单位拒绝,其中乙公司认为劳动合同约定明确,甲的车祸地点远离约定路段,故不能申请工伤认定,而甲妻的丁单位,根本就没有参加工伤保险。请回答下列问题:

甲妻单位未参加工伤保险是否影响其认定工伤,其法律后果如何()

A.影响

B.不影响

C.部分影响,赔偿额减少

D.部分影响,赔偿额增多

更多题库