If you cannot test geothermal heating principle to the construction, and the ground is absolutely not allowed to drill hammer and hammer nails, to prevent the destruction of the heating coil.

如果无法进行地热加温试验原则上不给施工，而且地上绝对不允许电锤打眼和锤钉，防止破坏加热盘管。

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Hammers - Technical specifications concerning steel hammer heads - Test procedures.

锤子。钢锤头技术规范。试验规程。

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Unbound and hydraulically bound mixtures - Part 4: test methods for laboratory reference density and water content - Vibrating hammer.

松散的和液力粘合的混合料。第4部分：实验室参考密度和水含量的测试方法。振动锤。

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That includes editors whose job is to "enthusiastically" scorch cars around cones on a test track, brake as hard as possible again and again, and hammer the throttle repeatedly in an attempt to produce top performance figures.

FORBES: Test Drives