用于脑灌注显像的显像剂,必须有以下特性() A.带正电荷 B.带负电荷 C.不带电荷

题型:单项选择题

问题:

用于脑灌注显像的显像剂,必须有以下特性()

A.带正电荷

B.带负电荷

C.不带电荷

D.一端带正电荷,一端带负电荷

E.亲水端带正电,疏水端带负电荷

考点:广东住院医师医学影像学核医学核医学题库
题型:单项选择题

“中学生在校读书,与税收无关”的观点   

A.正确,中学生不从事生产经营活动

B.错误,中学生也应自觉向国家纳税

C.错误,中学生应关心和监督税收的使用

D.正确,中学生不是直接纳税人

题型:单项选择题

Large, multinational corporations may be the companies whose ups and downs seize headlines. But to a far greater extent than most Americans realize, the economy’s vitality depends on the fortunes of tiny shops and restaurants, neighborhood services and factories. Small businesses, defined as those with fewer than 100 workers, now employ nearly 60 percent of the work force and are expected to generate half of all new jobs between now and the year 2000. Some 1.2 million small firms have opened their doors over the past six years of economic growth, and 1989 will see an additional 200,000 entrepreneurs striking off on their own.

Too many of these pioneers, however, will blaze ahead unprepared. Idealists will overestimate the clamor for their products or fail to factor in the competition. Nearly everyone will underestimate, often fatally, the capital that success requires. Midcareer executives, forced by a takeover or a restructuring to quit the corporation and find another way to support themselves, may savor the idea of being their own boss but may forget that entrepreneurs must also, at least for a while, be bookkeeper and receptionist, too. According to Small Business Administration data,24 of every 100 businesses starting out today are likely to have disappeared in two years, and 27 more will have shut their doors four years from now. By 1995,more than 60 of those 100 start-ups will have folded. A new study of 3,000 small businesses, sponsored by American Express and the National Federation of Independent Business, suggests slightly better odds: Three years after start-up, 77 percent of the companies surveyed were still alive. Most credited their success in large part to having picked a business they already were comfortable in. Eighty percent had worked with the same product or service in their last jobs.

Thinking through an enterprise before the launch is obviously critical. But many entrepreneurs forget that a firm’s health in its infancy may be little indication of how well it will age. You must tenderly monitor its pulse. In their zeal to expand, small-business owners often ignore early warning signs of a stagnant market or of decaying profitability. They hopefully pour more and more money into the enterprise, preferring not to acknowledge eroding profit margins that mean the market for their ingenious service or product has evaporated, or that they must cut the payroll or vacate their lavish offices. Only when the financial well runs dry do they see the seriousness of the illness, and by then the patient is usually too far gone to save.

Frequent checks of your firm’s vital signs will also guide you to a sensible rate of growth. To snatch opportunity, you must spot the signals that it is time to conquer new markets, add products or perhaps franchise your hot idea.

When opening small businesses, the most important thing for small-business owners to do is()

A. to make a thorough analysis on the market

B. to invest much more money in small business

C. to cut down the workers’ wages

D. to think carefully about the internal specific conditions in the small enterprises

题型:单项选择题

柴油机一般进气提前角为上止点前()度。

A.5~l0

B.10~30

C.40~80

D.40~l40

题型:单项选择题

油水界面张力低,原油易于()。

A、采出

B、增产

C、开发

D、流动

题型:单项选择题

国家规定不得归档的材料,被禁止的内容是什么?

更多题库