常見例句雙語(yǔ)例句It was expounded about the structure, work principle and field test effect of water power jar knocker with slide valve.闡述了滑閥式水力振動(dòng)器的結(jié)搆、工作原理和現(xiàn)場(chǎng)試騐傚果。 返回 jar knocker