问题描述：
[单选]
保护性熔剂一般最好以低熔点液体的形式使用，这使它能容易而有效地覆盖金属液表面。（）
A．A protective flux is generally best applied as a low melting point liquid, which can be easily and efficiently covered by using the molten metal surface.
B．A protective flux is generally best applied as a low melting point liquid, which can easily and efficiently cover the molten metal surface.
C．A protective flux is generally preferred to the form of a low-melting liquid, which enables it to cover the surface of the liquid metal easily and effectively.
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