If the site is small, it may be commanded by a gantry crane. 假如場(chǎng)地小，則可采用龍門(mén)式吊車(chē)進(jìn)行操作。
One difficulty in every building for heavy industry is the arrangement of the supports for an overhead crane. 重工業(yè)的所有廠(chǎng)房均存在一個(gè)困難問(wèn)題，即如何布置橋式吊車(chē)的支承結構。
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