【简答题】某车间同时运转10台机器,各台机器独立工作,每台机器出故障的概率为0.2,每台机器出故障时,只需一人维修,现配有2个维修工.问:机器出故障时得不到及时维修的概率是多少?
【简答题】The _____(discuss) is very hot. H e is _____(friend) to all of us. This is an ____(难忘的) holiday. He was attracted by the girl's _____(美丽) It is _____(harm) to smoke for young people. A lot of people t...
【简答题】某工厂现在平均每天比原计划多生产50 台机器,现在生产600 台机器所需时间与原计划生产450 台机器所需时间相同.设原计划每天生产x 台机器,则可列方程为 [ ] . . .
【判断题】有人溺水,立即呼救,就地取材,寻找棍棒,投向落水者。( )
【判断题】有人溺水,立即呼救,就地取材,寻找棍棒,投向落水者。判断对错
【判断题】有人溺水,立即呼救,就地取材,寻找棍棒,投向落水。
【判断题】有人溺水,立即呼救,就地取材,寻找棍棒、绳索等漂浮物,投向落水者。( )
【单选题】已知氢硫酸的 K 1 = 9.1 ́ 10 -8 、 K 2 = 1.1 ́ 10 -12 , 将硫化氢通入 [H + ] = 0.1 mol / L的溶液中达到饱和,此时溶液中 [S 2- ] 为( )。
【简答题】听下面一段材料,回答1-3题。 1. Where does the girl's uncle work? A. In a school. B. On a farm. C. In a factory. 2. Why did Mr. Gao leave school when he was young? A. His father was ill. B. He was ill. C. His fami...