关于辅助性T细胞被抗原活化,下述正确的是() A.需要与产生淋巴因子的吞噬细胞相互作

题型:单项选择题

问题:

关于辅助性T细胞被抗原活化,下述正确的是()

A.需要与产生淋巴因子的吞噬细胞相互作用

B.需要识别辅助细胞表达的MHC-Ⅱ类分子相连的抗原

C.不是B细胞应答的结果

D.加工处理的抗原由非巨噬细胞呈递给辅助性T细胞

E.对多糖类抗原的应答是必需的

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题型:单项选择题

阅读理解。

                                                             Back into the past…

1932 Liu Changchun (1901-1983) joined the 10th Olympic Games in Los Angeles, US. He is the first Chinese

        to attend (参加) Olympics. He took part in the 100m and 200m race.

1952 The People's Republic (共和国) of China sent its first delegation to the 15th Olympics in Helsinki, Finland.

        This delegation had 40 people. But they arrived too late and missed most of the events.

1984 China's first Olympics after its return to the IOC. China sent a large delegation to the 23rd Games in Los 

        Angeles, US. Xu Haifeng won a gold medal in the 50m pistol (手枪) shooting. It was China's first Olympic

        gold medal.

1996 China got 16 gold medals in the 26th Atlanta Olympics. It was fourth on the gold medal list. Wang Junxia

        won a gold medal in the 5,000m race, and broke the world record.

2000 China got 28 gold medals in the 27th Olympics held in Sydney, Australia. This time, China was third on the

        gold medal list. Fu Mingxia won a gold medal in the platform diving.

2004 China got 32 gold medals at the 28th Olympics in Athens, Greece. It held second place on the gold medal

        list. Liu Xiang won a gold medal in the 110m hurdle (跨栏). He is the first Asian to win this event.

1. Who is the first Chinese that won an Olympic gold medal?

A. Liu Changchun

B. Xu Haifeng

C. Liu Xiang

D. Fu Mingxia

2. When was the 28th Olympics held?

A. 1984

B.1996

C. 2000

D. 2004

3. How many gold medals did China get in Sydney Olympics?

A. 16

B. 27

C. 28

D. 32

4. Where did Wang Junxia break the world record in the Olympics?

A. Los Angles

B. Atlanta

C. Sydney

D. Athens

题型:单项选择题

如图所示,质量为m=1kg、长为L=0.8m的均匀矩形薄板静止在水平桌面上,其右端与桌子边缘相平.板与桌面间的动摩擦因数为μ=0.4.现用F=5N的水平力向右推薄板,使它翻下桌子,求力F至少要做多少功.(g=10m/s2

某同学针对这个问题提出如下观点:

①当板运动的距离等于板长的一半时,板就将翻下桌子;

②当力F的作用距离达到板长的一半时,力F所做的功最少.

请你判断这位同学的两个观点是否正确的?如果正确,请计算出力F所做的功的最小值;如果不正确,请用正确的方法计算出力F做功的最小值.

题型:单项选择题

与教师相比,幼儿更重视父母的评价。

题型:单项选择题

《食品添加剂卫生管理办法》的主要内容包括()。

A.明确规定了需申报审批的范围

B.对生产和经营作出严格规定

C.对标志和说明书的要求

D.对违法者处罚的规定

E.对添加剂的含义进行诠释

题型:单项选择题

企业价值主体是价值的()。

A.享用者

B.占有者

C.提供者

D.学习者

E.获取者

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