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问题 单项选择题

某营业性饭店厨房排油烟系统风量20000m3/h．油烟浓度13mg/m3，选择油烟净化设备的去除效率不应小于（）。

A.88%

B.90%

C.85%

D.80%

答案

参考答案：C

解析：见《饮食业油烟排放标准》GB18483-2001（简称《油烟排放标准》）规定，最高允许排f放浓度为2.Omg/m3，则：η=（13-2）/13≈0.85

选择题

下列气体中，常可用于充入食品包装袋防腐的是 [ ]

A．氮气

B．氧气

C．一氧化碳

D．二氧化硫
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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.

A total of 72 passengers are on a ship, and they go out on an excursion in boats R and Q. How many of the ship’s passengers are female ？（）
(1) There are 13 females on boat Q.
(2) There are equal numbers of women on boats R and Q.

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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