请说出液压梯和普通钢丝绳电梯的优缺点?
参考答案:液压梯:优点是载重量大,不需要顶层机房;缺点是提升高度有限,速度低,维护不方便。
普通钢丝绳电梯:优点是提升高度、速度可以作到很大,维护方便;缺点是载重量有限,一般需要顶层机房。
请说出液压梯和普通钢丝绳电梯的优缺点?
参考答案:液压梯:优点是载重量大,不需要顶层机房;缺点是提升高度有限,速度低,维护不方便。
普通钢丝绳电梯:优点是提升高度、速度可以作到很大,维护方便;缺点是载重量有限,一般需要顶层机房。
完形填空。 | |||
Bringing a giraffe into the world is a tall order.A baby giraffe falls 10 feet from its mother's | |||
( )1.A.back ( )2.A.look ( )3.A.raises ( )4.A.throws ( )5.A.difficult ( )6.A.get up ( )7.A.demand ( )8.A.excited ( )9.A.strong ( )10.A.Why ( )11.A.slowly ( )12.A.danger ( )13.A.hate ( )14.A.teach ( )15.A.accepted ( )16.A.kindness ( )17.A.history ( )18.A.injured ( )19.A.nowhere ( )20.A.change | B.side B.move B.lowers B.finds B.greedy B.work on B.struggle B.worried B.dusty B.When B.quickly B.love B.punish B.urge B.remembered B.greatness B.record B.beaten B.anywhere B.support | C.front C.lesson C.pulls C.points C.unreasonable C.lie down C.request C.surprised C.weak C.Where C.carefully C.silence C.enjoy C.remind C.declared C.nature C.thread C.killed C.everywhere C.blame | D.head D.class D.draws D.positions D.uncreative D.come up D.failure D.tired D.short D.Which D.frequently D.safety D.watch D.allow D.understood. D.expectation D.means D.hurt. D.somewhere D.destroy |