But the instruments of testing heat check, stress and linear shrinkage of casting alloy at present are not only inconvenient in operation but also unitary in function.
已有的测定铸造合金热裂、应力、线收缩参数的仪器不仅操作不便，而且功能单一。
But the instruments of testing heat check, stress and linear shrinkage of casting alloy at present are not only inconvenient in operation but also unitary in function.
已有的测定铸造合金热裂、应力、线收缩参数的仪器不仅操作不便，而且功能单一。
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