【单选题】下列叙述中,错误的是
A.
离子键只存在于离子化合物中,不存在于共价化合物中
C.
硫单质与金属铁反应生成硫化亚铁(FeS),体现了硫单质的氧化性
D.
FeCl 2 既有氧化性,又有还原性,不能通过铁和氯气反应制得FeCl 2
【单选题】D irections: Listen to the conversation again and choose the best answer to each of the questions you hear on the recording.
A.
People should find new ways to use solar energy.
B.
The speaker is tired of living in earth-sheltered houses.
C.
The speaker doesn ’ t think the idea of earth-sheltered houses is new.
D.
People should be more interested in old things.
【单选题】计算机软件中使用的短语“保留所有权力”指什么?
D.
软件的创建者和购买者都有权复制、分发或修订产品
【单选题】D irections: Listen to the conversation again and choose the best answer to each of the questions you hear on the recording.
B.
A special plastic material.
【单选题】计算机软件中使用的短语“保留所有权力”指【 】。
D.
软件的创建者和购买者都有权复制、分发或修订产品
【简答题】irections: For this part, you are allowed 30 minutes to write an essay. Suppose you have two options upon graduation: one is to take a job in a company and the other to go to a graduate school. You ar...
【单选题】计算机软件中使用的短语“保留所有权力“指( )。
D.
软件的创建者和购买者都有权复制、分发或修订产品
【简答题】E xercise 2 D irections: Fill in the blanks with the dates and years you hear. 1. Albert Einstein was born ___, and died_____.
【单选题】下列叙述正确的是( )
B.
离子键只存在于离子化合物中, 不存在共价化合物中 C由极性键结合的分子一定是极性分子 D 极性分子中一定不含非极性键