?两端支承梁

... beam support 梁式支架 beam supported at both ends 两端支承梁 beam-switching tube 射束开关管，电子束开关管，射线开关 ...

?端托梁

... beam supported at both ends 端托梁; 两端支承梁 beam supported of both ends 简支梁 beam with both ends built in 固端梁; 两端固定梁 ...