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13.按基本额定动载荷通过计算选用的滚动轴承，在预定的使用期限内，其工作可靠度为()。
二、判断题（下述说法正确的请在选项上选“T”，否则选“F”,本大题共10小题，每小题3分，共30分）1.独立电流源不可以短路（）。
1.—Don'truninthehallways!It'sdangerous!—.
2.—Ilikethepartysomuch,butIgohome.It’stoolate.—Whatapity!
3.—arethechildrendoingnow?—They'replayingsoccerontheplayground.
4.—WhereisAndy?—Heisreadingunderthebigtreeinthe.
5.—Whycan'tMaryseetheblackboard?—Becauseaboysitsher,andheisverytall.
6.—WhatdoesJenniferlooklike?—.
7.—I'mverythirstynow.Iwouldliketodrinksome.—Hereyouare.A.B.orangesC.orange
8.—Whenhetothezoo?—Yesterday.
9.—Itismyturn.Ifeelalittlenervous.—!Youcanmakeit!A.B.C.D.
10.Hehastwodaughters.Oneisanurse,isateacher.
11.—Tom!YoutoomuchtimewatchingTV!—Sorry,Mom.I'llturnitoffatonce.
12.Jerry'sfatherisagood.HecanRussianandChinesefoodwell.
14.—IsJackondutytoday?—Itbehim.It'shisturntomorrow.