若销售单价与单位变动成本呈同方向、同比例变动，则单一品种的产品保本点业务量不变（）

Directions: Complete the following passage by filling in each blank with one word that best fits the context．

You are mistaken if you think all Chinese people speak in the same way. Have you ever seen a person from Shanghai try talking to someone  48  Guangzhou?  49  is quite likely that both of them may feel puzzled! The Chinese language, as a whole, uses the same set of character,  50    even the same characters can have different pronunciations. That is   51  

it is difficult for people to understand each other. Luckily, the widespread use of Putonghua in China has made a great contribution    52   people’s communication, though people from different areas tend to speak with various accents.

People in Northern Europe are    53   luckier. Even though people from Sweden , Denmark and Norway have their own official languages, it is very convenient    54   them to communicate with one another. Do you know why? That is because their languages are quite similar, though not without small distinctions.   55  , they can communicate easily in their mother tongues.

如图是家庭、宾馆常用的电热水壶，表中列出了其部分技术参数．

(1)电热水壶正常工作时的电流是多少?

(2)电热水壶正常工作时，用6min就能将整壶水烧开，如果水吸收的热量是3.24×10⁵J，则该电热水壶的效率是多少?

下列说法哪些是正确的

A．我国对发明专利申请实行实质审查制

B．授予实用新型专利权的决定公告后，任何人均可以请求国家知识产权局作出实用新型专利检索报告

C．国家知识产权局及其专利复审委员会应当按照客观、公正、准确、及时的要求，依法处理有关专利的申请和请求

D．在专利申请公布或者公告前，国家知识产权局的工作人员及有关人员对其内容负有保密责任

以猪皮为原料制成的为( )

A．甲胶
B．黄明胶
C．阿胶
D．角胶
E．新阿胶

药品上市销售前需经指定的药品检验所进行的检验属于（）

A.抽查检验

B.注册检验

C.指定检验

D.复验