请写出如图所示的实验装置是分别研究什么规律的: (1)______. (2)__

题型:问答题

问题:

请写出如图所示的实验装置是分别研究什么规律的:

(1)______.

(2)______.

(3)______.

(4)______.

考点:杠杆的平衡条件动能和势能的应用物体内能的改变方法(做功、热传递)并联电路的电流规律
题型:问答题
读下面短文,从短文后面各题的A、B、C、D四个选项中,选出适合填入对应空白处的最佳选项,并在答题卡上将该项涂黑。
Every summer a great many students travel to other countries looking for work and adventure. Most of the    26        are in seasonal work, mainly connected with wourism and    27         
The pay is usually poor, but most people work abroad for the     28    of travel. You can pick grapes on farms in France, entertain kids on American summer camps, and, of course, there are  29    jobs in hotels and restaurants.
But it is not easy now to find work. “    30   you speak the language of the country well, there will be very few openings,” says Althea Ellis, an adviser in     31       for students.
“If you work with a family in Italy, you’ll have to speak Italian. When you wash dishes in a restaurant in Pairs, the owner will expect you to speak   32    . British students only have a language     33     for jobs in the USA and Australia.”
    34     enjoys the experience. Sarah James was employed to help forty American children in Europe. The two teachers with the children had never been     35     .One child lost his passport; another became seriously ill and was      36      home; the whole group was thrown out of one hotel because of the      37      they made, and what’s worse, Sarah herself was robbed on her only    38    evening of the entire trip. “ I did visit a lot of new places,” she says,“ but it wasn’t worth it. The pay was     39     and it really was a 24-hour-a-day job. The kids never slept!”
“The troubles is, students expect to have a(n)     40    time of it.” Althea Ellis points out. “After all, they see it as a    41     .In practice,     42      ,you have to work hard. At the same time, all vacation work is casual (临时的) work. You’ll have a job when the hotel, the restaurant, or the campsite is busy. In the other words, you’ll work if it’s convenient for the company that     43    you. But you have      44    employment rights. As soon as the holiday season      45     ,they’ll get rid of you.”
小题1:
A.works
B.challenges
C.changes
D.hardships
小题2:
A.service
B.industry
C.business
D.science
小题3:
A.pains
B.comfort
C.difficulty
D.excitement
小题4:
A.always
B.hardly
C.never
D.seldsom
小题5:
A.If
B.Unless
C.Because
D.Although
小题6:
A.health care
B.vacation work
C.language studies
D.tourist safely
小题7:
A.Italian
B.English
C.French
D.Spanish
小题8:
A.chance
B.ability
C.possibility
D.advantage
小题9:
A.No one
B.None
C.Not everyone
D.Everybody
小题10:
A.abroad
B.employed
C.sad
D.respected
小题11:
A.driven
B.ridden
C.left
D.flown
小题12:
A.friends
B.decisions
C.noise
D.destruction
小题13:
A.busy
B.free
C.tiring
D.pleasant
小题14:
A.nice
B.reasonable
C.fair
D.poor
小题15:
A.hard
B.easy
C.difficult
D.ordinary
小题16:
A.holiday
B.job
C.festival
D.study
小题17:
A.besides
B.therefore
C.however
D.meanwhile
小题18:
A.fires
B.employs
C.recommends
D.appreciants
小题19:
A.few
B.little
C.all
D.much
小题20:
A.starts
B.lasts
C.approaches
D.finishes
题型:问答题

在我国,用于早期食管癌大规模筛检的方法是()。

A.食管镜检查

B.食管拉网脱落细胞学检查

C.X线钡剂造影

D.胸部CT

E.锁骨上淋巴结活检

题型:问答题

印刷饥的着墨系数是用百分比来表示的.它是使指印版从某一根着墨辊上得到的墨量占印版上所得到的总墨量的比值。

题型:问答题

矿尘对人体的危害主要表现在哪些方面?

题型:问答题

对已经发行的证券进行买卖、转让和流通的市场是()。

Ⅰ.发行市场

Ⅱ.流通市场

Ⅲ.一级市场

Ⅳ.二级市场

A.Ⅰ、Ⅲ、Ⅳ

B.Ⅱ、Ⅳ

C.Ⅰ、Ⅱ

D.Ⅰ、Ⅳ

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