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Direction: read the following passage and decide whether the statements are True or False. [A] The operators declined to provide specific data on their losses. They said theft and vandalism were common in the early months of operations but have dropped significantly since then. Because the bikes are equipped with GPS, the recovery rate is high, they said. “Fifty percent is extremely high,” said Euwyn Poon, co-founder and resident of Spin, which plans to add scooters to its fleet. “We don’t really experience bikes going missing or being vandalized in D. C. or in other parts of the country.” [B] “Initially, when the service was brand new, there was some loss and vandalism. When you have a product that’s available for public consumption, you account for that,” Poon said. “However, that has decreased dramatically as bike-share has become more ingrained in the public infrastructure.” [C] The companies have been operating in the city since a pilot program launched in September. The pilot was scheduled to end in April but was extended to the end of August. City officials are expected to come up with a plan for a permanent program during this testing period and are evaluating how the bike services are performing, including problems with theft and vandalism. [K] Some companies say promotions in the early days of the program may have led to problems. For example, riders taking advantage of free riders weren’t securely locking the bikes after completing a trip. Thieves are then able to use the unlocked bicycles to take rides without using a credit card. Some companies say they now offer incentives for customers to properly lock the bikes. [L] City transportation officials say the pilot’s cap on the number of bikes is essentially to limit bike litter. But as part of the pilot, they are assessing whether demand exists to raise the limit or eliminate it. The companies say 400 bikes are not enough to make a profit and deploy them to all four quadrants of the city as required.
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【单选题】某企业单位产品成本计划在上月的基础上降低2%,实际降低1.5%,则单位产品成本降低计划完成程度为( )
A.
75%
B.
100.5%
C.
99.5%
D.
133.2%
【简答题】磨损失效类型有几种?如何防止零件的各类磨损失效 ?
【简答题】磨损失效类型有几种?如何防止零件的各类磨损失效?
【单选题】铁碳合金相图上的C点表示的是()。
A.
纯铁的熔点
B.
渗碳体的熔点
C.
共析点
D.
共晶点
【单选题】纯铁的熔点是( )表示。
A.
1358℃
B.
1538℃
C.
1678℃
D.
1768℃
【单选题】把生态文明建设纳入( )轨道,用制度保障生态环境、推进生态文明建设。
A.
生态建设
B.
经济化
C.
生态化
D.
制度化、法治化
【单选题】纯铁的熔点是( )表示
A.
1538℃
B.
1658 ℃
C.
1358℃
【简答题】我国由于硫磺主要依靠进口,所以目前主要以硫铁矿(FeS 2 )为原料制硫酸,俗称硫铁矿法. (1)写出硫铁矿与氧气反应的化学方程式:______ 工业上,该反应在______(填设备名称)中进行. (2)某含有SiO 2 的硫铁矿试样1克,在氧气中充分灼烧后残余固体为0.76g,则该硫铁矿式样的纯度为______%.已知SO 3 熔点16.83℃、沸点44.8℃.某兴趣小组利用SO 2 和O 2 ...
【单选题】某企业单位产品成本计划在上月的基础上降低2%,实际降低1.5%,则单位产品成本降低计划完成程度为( )
A.
0.75
B.
1.005
C.
0.995
D.
1.332
【单选题】几种物质的熔点如下表所示,由表中的数值可以得出的正确结论是 [     ]
A.
纯铁掉入钢水中一定能够熔化
B.
水银温度计在气温为40℃的地方不能再使用
C.
电灯泡内的灯丝宜用钨丝制作,因为它的熔点较高
D.
用铜锅冶炼钢是可以的
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