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【单选题】
Metro North Railway is trying to decide whether or not to run an additional train into New York City from New Haven, Connecticut at 8:15 a.m. The total cost of running trains between 8:00 a.m. and 9:00 a.m. is $45,000 and the expected revenues on any given day are $100,000 during this time period. The cost of running the additional train is $4,000 and it is expected that revenues will rise to $103,500. Metro North should ( ).A.
run the train because the total revenues are greater than the total costs
B.
run the train because the firm’s revenues will rise
C.
not run the train because the total costs are already too high
D.
not run the train because the marginal cost of $4000 is greater than the marginal revenue of $3,500
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【简答题】某一偏置曲柄滑块机构,已知行程速比系数 K = 1.4,则极位夹角 θ =______度。
【单选题】根据《最高人民法院关于审理旅游纠纷案件适用法律若干问题的规定》，旅游经营者有权要求旅游者支付合理费用，下列表述错误的是
A.
在旅游行程开始前的合理期间内，因旅游者转让旅游合同的，旅游经营者可以请求旅游者、第三人给付增加的费用
B.
旅游行程开始前或者进行中，因旅游者单方解除合同的，旅游径营者可以请求旅游者支付合理费用
C.
因暴风雪导致行程变更，经旅游者同意后，旅游经营者可以请求旅游者分担因此增加的旅游费用
D.
旅游经营者可以请求旅行团中的儿童、老年游客支付一定的安全保障费