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问题 单项选择题

时间分辨免疫分析所用的标记物是（）

A.镧系元素

B.异硫氰酸荧光素

C.辣根过氧化物酶

D.罗丹明

E.吖啶酯衍生物

答案

参考答案：A

解析：时间分辨免疫分析是用镧系稀土元素螯合物标记抗体或抗原，检测标本中的相应抗原或抗体。

单项选择题

下列哪一个是包铝材料？（）

A.纯铝和铝合金交叠而成的叠层钣材

B.纯铝芯材外部包覆铝合金

C.纯铝和铝合金构成的混合物

D.铝合金芯材外部包覆纯铝
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单项选择题

The China boom is by now a well-documented phenomenon. Who hasn’t (1) the Middle Kingdom’s astounding economic growth (8 percent annually), its mesmerizing (2) market (1.2 billion people), the investment ardor of foreign suitors ($40 billion in foreign direct investment last year (3) ) China is an economic juggernaut. (4) Nicholas Lardy of the Brookings Institution, a Washington D. C.-based think tank,

" No country has (5) its foreign trade as fast as China over the last 20 years. Japan (6) its foreign trade over a 20-year period; China’s foreign trade as quintupled. They’ve become the pre-eminent producer of labor-intensive (7) goods in the world " . But there’s been (8) from the dazzling China growth story—namely, the Chinese multinational. No major Chinese companies have (9) established themselves, or their brands, (10) the global stage. But as Haier shows, that is starting to change. (11) 100 years of poverty and chaos, of being overshadowed by foreign countries and multinationals, Chinese industrial companies are starting to (12) on the world.A new generation of large and credible firms has (13) in China in the electronics, appliance and even high-tech sectors. Some have reached critical mass on the mainland and are now (14) new outlets for their production—through exports and by building Chinese factories abroad, chiefly in Southeast Asia. One example: China’s investment in Malaysia (15) from $8 million in 2000 to $766 million in the first half of this year. (16) China’s export prowess, it will be years (17) Chinese firms achieve the managerial and operational expertise of Western and Japanese multinationals. For one thing, many of its best companies are still at least partially state-owned. (18) , China has a shortage of managerial talent and little notion of marketing and brand-building. Its companies are also (19) by the country’s long tradition of central planning, inefficient use of capital and antiquated distribution system, (20) makes building national companies a challenge.

（11）处填（）

A.Behind

B.Before

C.Since

D.After
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