题目内容
（请给出正确答案）
A.直射光
B.散射光
C.反射光
D.透射光
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更多“Mark6保留了Graviner建立的差动测量系统，使系统有高灵敏度，最大限度地降低了误报警的发生。该系统仍然使用光学传感测量方法，但用()测量。”相关的问题
A、Adventures of Huckleberry Finn
B、Jane Eyre
C、Pride and Prejudice
D、The Quilt
A、n'ont pas eu les moyens
B、n'ont pas voulu
C、n'ont pas su
D、ne voulaient pas
rademarks (商标) identify and distinguish the products of one business firm from those of another. It may include a word，a sentence，a name，a symbol，a picture，or any combination of these. Trademarks must be attached directly to the product. Many trademarks contain the name of the owner of the business. But manufacturers often use some word to describe the qualities of the product，or make up a word. The spoken part of a trademark is called the brand name.
Trademarks provide a simple way for people to determine who is responsible for a particular item. They also help people identify the brands they liked in the past so they may purchase them again. Manufacturers use trademarks to promote the sale of their goods.
Service marks also identify goods and services. They do not have to be attached to a product. Companies that provide services to the public，such as transportation companies，use these marks to advertise their services. For example，a blue sign with a bell，the symbol of the American Telephone and Telegraph Company，tells every passer-by that a public telephone is available for use.
Laws to protect the rights of the trademark owner were developed in the early 1800's.Most countries now provide for regulation and registration of trademarks. An important protection for trademark rights is federal(联邦的)registration. In 1905，the U.S. Congress passed the first federal law on trademark registration to be held constitutional.
31.What may NOT be included in a trademark as mentioned in the first paragraph? ()
[A] A nice picture.
[B] A meaningful symbol.
[C] A national flag.
[D] A person‘s name.
32.We learn from the second paragraph that trademarks are useful in that ___________.
[A] they help manufacturers to control the prices of their products
[B] they offer people the information about market in a simple way
[C] they make customers aware of their own responsibility for the items
[D] they enable customers to purchase the goods they prefer
33.The word “promote” in the last sentence，paragraph 2，probably means “____________”。
[A] to give higher position or rank
[B] to try to increase the popularity
[C] to keep safe from harm or danger
[D] to make a promise
34.According to the third paragraph，a blue sign with a bell ____________.
[A] is not a trademark but a symbol
[B] is a trademark of transportation
[C] stands for a kind of service
[D] stands for a road map
35.Which of the following statements is true according to the passage?（）
[A] Trademarks must be attached to all products.
[B] Service marks not only identify products but also help to advertise services.
[C] Laws to protect trademark owners were probably developed between 1801-1810.
[D] Local registration is the only protection for trademark rights.
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