目前中国高炉从风口喷吹的固体燃料主要是（）。

如图所示A、B两点分别固定带有等量同种电荷的点电荷，M、N为AB连线上的两点，且AM=BN，则（　　）

A．M、N 两点的电势和场强都相等

B．M、N 两点的电势和场强都不相等

C．M、N 两点的电势不同，场强相等

D．M、N 两点的电势相同，场强不相等

近年来，我国气象灾害频发。读我国某地区气象灾害成因示意图，分析回答下列问题。

（1）说出图中甲、乙、丙代表的气象灾害名称。

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（2）判断该地区最有可能是我国什么地区？并简述理由。

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半圆的周长=圆周长÷2______．

A typical (11) language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to "spaceless’ values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the (12) . In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having (13) results during expression evaluation stored at the discretion of the language implementation, and effecting parameter (14) and (15) operations through value copying.

A．foreground

B．background

C．screen

D．scenes

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