An analog signal is composed of four basic components: DC and AC magnitudes, frequency, and phase.

模拟信号由直流和交流分量、频率和相位四部分组成。

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AC is composed of four states, as shown in Figure 2.

AC由四个状态组成，如图2所示。

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It is composed of four different commands, connected by pipes.

它包含四个命令，这四个命令通过管道连接在一起。

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The Council is composed of thirty-four Member States of the United Nations Educational, Scientific and Cultural Organization, elected by the General Conference at its ordinary sessions, taking due account of equitable geographical distribution, of the need to ensure appropriate rotation, of the representativeness of these States from the ecological viewpoint in the various continents, and of the importance of their scientific contribution to the international MAB programme.

UNESCO: Detailview | United Nations Educational, Scientific and Cultural Organization

The project, composed of four phases, is to conduct a series of pilot Intangible Cultural Heritage inventory-making activities on a grassroots level in six Sub-Saharan African countries, namely Botswana, Lesotho, Malawi, Uganda, Swaziland and Zambia.

UNESCO: Patrimoine culturel immat��riel

The Supreme Court is composed of nine justices, five seen as conservatives and four as liberals.

BBC: Obama health law faces Supreme Court judgement