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问题 单项选择题 A1/A2型题

氟氯烷烃类抛射剂F12是指（）

A.三氯-氟甲烷

B.一氯二氟丁烷

C.二氯四氟乙烷

D.二氯二氟甲烷

E.一氯-氟甲烷

答案

参考答案：D

解析：氟氯烷烃类抛射剂F12是指二氯二氟甲烷。所以答案为D

单项选择题

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

The integer x is how much greater than 4 ？（）

(1)

(2) 10x=1,000,000

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.
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填空题

影响硬质合金钻进效率的主要因素有（）、硬质合金钻头的质量及钻进时的操作技术和钻进规程等。
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