题目内容

The Chinese government has officially ____the global gambling industry, which makes it likely that Chinese citizens will be gambling much less in China, its neighboring countries, and the US.

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A big ____tigers die of human demand for their bones.

We are working with computer experts ____such accidents do not happen again.

This shelf holds 80 pairs of shoes with prices ____$120 to $150 each.

什么是副载波调制，简要说明其原理。