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某屋外220kV变电所，海拔1000m以下，试回答下列问题：

若地处缺水严寒地区，主变125MVA，灭火系统宜采用（）。为什么？

A.水喷雾

B.合成泡沫

C.排油注氮

D.固定式气体

答案

参考答案：D

选择题

细胞不能无限长大的主要原因是            [ ]

A．细胞长得太大影响生物体的整体美观

B．细胞长得太大就不能进行分裂

C．细胞长得太大，相互之间就会挤压，最终细胞会被挤破

D．细胞体积增大，表面积与体积之比变小，细胞表面的吸收能力不能满足细胞的需求

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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.

Is the triangle depicted above equilateral ？（） (Figure not necessarily drawn to scale.)

(1) x+y+z=180°

(2) y=z

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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