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在线性从量资费形式下，用户消费总支出与业务使用数量（）。
A . 成正比
B . 成反比
C . 线性相关
D . 非线性相关
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推荐知识点:
One carrying vessel was sailing for Singapore from Tianjin. In transit, the vessel caught fire, and the fire spread quickly. In order to protect the ship and goods, the captain ordered to pour water into the space. Later the fire was put out, but the engine was damaged and the vessel had to be repaired. The captain decided to hire a tugboat to drag the vessel to a nearby port to have it repaired. The losses and damages caused by the fire are as follows : (1) 1 000 cases of goods were burnt down; (2) 600 cases of goods were soaked;(3) engine and deck were damaged by the fire; (4) tugboat expenses; (5) fuel expenses and wages paid to the crew. Question : Please analyze the nature of the above losses and expenses. (Translate the case into Chinese and then answer the question)
当发生手足搐搦症时，说明其血钙已低于（）
HbV复制和传染性的直接标志是（）
何谓结构上的作用？
根据《仲裁法》的规定，当事人申请撤销仲裁裁决的，应当自收到仲裁裁决书之日起()时间内提出。
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网站上有近40%的访客在使用站内搜索，但多数搜索结果是0，并且没有产生收入，这个时候应该采取的行动是：（）