问题 选择题

某同学的下列实验操作或测定的数据不合理的是(  )

A.用pH试纸测得某地水样的pH为6

B.用托盘天平称得某小苏打样品的质量为16.7g

C.用烧杯量取了2.5mL的水

D.测得某粗盐中氯化钠的质量分数为90.5%

答案

A、用pH试纸测定溶液的酸碱度只能精确到整数值,题中用pH试纸测得某地水样的pH为6,数据记录合理.

B、托盘天平能准确称量到0.1克,用托盘天平称得某固体的质量为16.7g,数据记录合理.

C、烧杯上面虽然有刻度,但不属于计量仪器,刻度的单位比较大,无法精确到0.1g,无法量取2.5mL水,数据记录不合理.

D、氯化钠的质量分数=

氯化钠的质量
粗盐的质量
×100%,可以计算出结果为90.5%,数据记录合理.

故选C.

单项选择题

The term "nationalism" is generally used to describe two phenomena: (1)the members of a nation care about their national identity and(2) that the members of a nation seek to achieve (or sustain) self-determination.

It is traditional, therefore, to distinguish nations from states—whereas a nation often consists of an ethnic or cultural community, a state is a political entity with a high degree of sovereignty. While many states are nations in some sense, there are many nations which are not fully sovereign states. As an example, the Native American Iroquois constitute a nation but not a state, since they do not possess the requisite political authority over their internal or external affairs. If the members of the Iroquois nation were to strive to form a sovereign state in the effort to preserve their identity as a people, they would be exhibiting a state—focused nationalism.

Nationalism has long been ignored as a topic in political philosophy, written off as a relic from bygone times. It has only recently come into the focus of philosophical debate. The surge of nationalism usually presents a morally ambivalent and for this reason often fascinating picture. "National awakenings" and struggles for political independence are often both heroic and inhumanly cruel; the formation of a recognizably national state often responds to deep popular sentiment, but can and does sometimes bring in its wake inhuman consequences, including violent expulsion and "cleansing" of non-nationals, all the way to organized mass murder. The moral debate on nationalism reflects a deep moral tension between solidarity with oppressed national groups on the one hand and repulsion in the face of crimes perpetrated in the name of nationalism on the other.

Nationalism may manifest itself as part of official state ideology or as a popular (non-state) movement and may be expressed along civic, ethnic, cultural, religious or ideological lines. These self-definitions of the nation are used to classify types of nationalism. However, such categories are not mutually exclusive and many nationalist movements combine some or all of these elements to varying degrees. Nationalist movements can also be classified by other criteria, such as scale and location.

Nationalism does not necessarily imply a belief in the superiority of one race over others, but in practice, many nationalists support racial protectionism or racial supremacy. Such racism is typically based upon preference or superiority of the indigenous race of the nation.

The example of Native American Iroquois is used in paragraph 2 to ()

A. show the differences between nations and states

B. discuss the differences between internal and external affairs

C. indicate their strive to form a state

D. present their identity as a people

单项选择题