老头儿沉思不语，看着那投镖板。
应用现代控制理论对自动换梭织机投按侧板振动的主动控制进行了研究，为振动主动控制的可行性提供了理论依据。
We have studied the feasibility of active vibration control of shuttle loom by using modern control theory and establishing the state-variable equation of the nexible beam and picking plate system.
板式热交换器投用不到两年，板片就出现了严重的腐蚀现象。
Put into using in less than two years, the plates of plate-type heat exchanger were found to be corroded badly.
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