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The properties of tempered steel enable us to use it in the manufacture of tools, which need a fairly hard steel.句中，which引导的非限制性定语从句是用来补充说明（ ）。
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The properties of tempered steel enable us （ ）it in the manufacture of tools, which need a fairly hard steel.
Other shaping operations include drawing into wire, casting in moulds, and forging.这个句子中，有（ ）个并列的宾语。
There is no tendency for hardening by mechanical work until the lower limit of the recrystalline range （）.
There is no tendency for hardening by mechanical work until the lower limit of the re-crystalline range is reached.句子中，tendency 的含义的（ ）。
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