对于直径很小的钢制圆柱齿轮,若齿根圆到键槽底部的距离为(),做成齿轮轴。
A. <2mt
B. <2ma
C. <3mt
D. <3ma
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齿轮采用浸油润滑时,油池中的油量应保持齿轮顶圆距离箱底不小于(),避免搅起箱底的杂质。
A. 小于30~50mm
B. 大于30~50mm
C. 小于20~50mm
D. 大于20~50mm
闭式齿轮传动,润滑方式是由齿轮圆周速度大小决定的。
A. 对
B. 错
闭式齿轮传动,齿轮的圆周速度在v<12~15m/s时,大齿轮浸入油池中进行浸油润滑。
A. 对
B. 错
阅读理解四Directions:The following is part ofInformation for Tourists {At Your Service). After reading it,you are required to findthe items equivalent to (与"••“等同)those given inChinese in the table below. Then you should put thecorresponding letters in the brackets on the Answer Sheet,numbered 51 to 55.A—Information Center B—FirstAidC—May Remain inWheelchair D—ParkingLot AssistanceE—ATM (Automatic TellerMachine) Locations F—Baby CareCenterG——Parade Route H——LockersI—Services for Guestswith Disabilities J—PhotoSpotK——Lost and Found L—Assisted-ListeningDevice AvailableM—Guided Tours N—VegetarianSelectionO—Foreign Currency P—CreditCardsExamples: ( G )游览路线1. ( )提供助听器( ) 外币兑换处________________2.()婴儿照料中心()残疾人服务________________3.() 导游参观() 失误招领处_______________4.()自动取款机()停车服务________________5.()急救站()拍照点_________________