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什么叫滴定曲线？什么叫酸碱滴定曲线？

答案

参考答案：

以横坐标为滴定量、纵坐标表示对应量的曲线叫滴定曲线。表示酸碱滴定过程中被滴定溶液pH值随标准滴定溶液加入量而变化的曲线称为酸碱滴定曲线。

单项选择题

饭店开业一年后可申请星级，经星级评定机构评定批复后，可以享受()有效的星级及其标志使用权。

A．2年

B．3年

C．4年

D．5年
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单项选择题

A new study finds that blacks on death row (1) of killing whites are more likely to be executed than whites who kill minorities. It also concludes that blacks who kill (2) minorities are (3) likely to be executed than blacks who kill whites. For example, there is more than a twofold greater risk that an African-American who killed a white will be executed than a white person who kills a (4) victim. A Hispanic is at least 1.4 (5) more likely to be executed (6) such an offender kills a white.

The researchers of the study believe that there are two (7) explanations.. First, prosecutors often win (8) office if they win well-publicized cases. When a black kills a white, such killings gets more (9) and this idea can be (10) by many famous cases. (11) , the court judges at the state level are often (12) to elections, called retention elections. Retention election or judicial retention within the United States court system, is a periodic process, in which the voter (13) approval or disapproval for the judges presently (14) their position, and a judge can be removed from the position if the (15) of the citizens vote him or her out. Just as the researchers (16) out, death penalty is (17) political.

The findings of the study, in short, show that American justice systems clearly (18) white lives more than those of blacks or Hispanics. The researchers also say their findings (19) serious doubts about (20) that the U.S. criminal justice system is colorblind.

20（）

A.dissertations

B.affirms

C.claims

D.suggestions
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