由于()钩型吊钩组横向尺寸较小,对减小钢丝绳偏角有利,且不受分支数限制,故应用较广。

题型:单项选择题

问题:

由于()钩型吊钩组横向尺寸较小,对减小钢丝绳偏角有利,且不受分支数限制,故应用较广。

A、短

B、长

C、扁

D、宽

考点:天车工考试高级天车工高级天车工题库
题型:单项选择题

用铜片、锌片和稀硫酸及若干其他器材组合成一个原电池,画出装置图并回答        (1)画出装置图。

(2)从理论上讲,预期看到的现象是             

(3)实验过程中,观察到锌片上有少量气泡冒出,铜片上有大量气泡冒出。试解释:        。

(4)此电池的负极是      ,正极的电极反应式是                      

(5)该电池工作一段时间,将两个电极小心取出洗涤并晾干,经称量发现锌片比原来减少3.25 g。请计算理论上导线中共通过了      mol电子

题型:单项选择题

某市统计局进行入户调查,调查员王某在对某企业进行调查时,该企业有关人员要求王某出示调查证件。王某未出示证件,而是出示了印有国家统计局批准文号的调查表,说明是国家调查任务,企业必须填报。该企业以王某不能出示有效证件为名,拒绝填报。请根据上述情况,回答下列问题。

统计调查表的右上角是调查表的法定标识,法定标识包括()。

A.表号

B.制定机关

C.有效期限

D.批准或者备案文号

题型:单项选择题

钢的表面强化工艺

题型:单项选择题

农田生态系统中,假设有两条主要的食物链:

如果有人大量捕捉蛙,短期内对该个生态系统造成的影响是()

A.有利于生态系统的平衡

B.水稻虫害严重

C.蛇的数量迅速增加

D.鼠的数量迅速增加

题型:单项选择题


The United States counts its population every ten years, and each census reveals that the racial and ethnic mix is changing dramatically, so by the year 2050, the "average" American will not be descended from (1) , but the majority of U. S. residents will trace (2) ancestry to Africa, Asia, the Hispanic world, the Pacific Islands, or the Middle East. Once the United States was a microcosm of European nationalities, (3) the United States is a microcosm of the world. The United States is (4) considered a "melting pot" society by many of its residents. (5) , many people prefer the term "salad bowl." They use this (6) to describe American society. American society will soon be (7) nonwhite. "Melting pot" implies that the different ethnic groups blend together (8) one homogeneous (9) , "salad bowl" (10) that nationalities, like the ingredients in a mixed green salad, retain their cultural (11) . Earlier generations of (12) believed they had to learn English quickly not only to survive but also for (13) .
Now, many immigrant groups do not (14) the same need. Because there are many places in America (15) you can work, shop, get medical care, marry, divorce and die without knowing English. (16) , Chinatown in San Francisco and New York. Also, Los Angeles has many Vietnamese immigrants and immigrants from Mexico. (17) , many immigrant groups want their children to know their (18) culture. Many Hispanics, for instance, want their children to learn (19) English and Spanish and study the Spanish language in school. They are fighting for the (20) to bilingual education in many communities. In many communities they are in the majority.

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