问题
单项选择题
喷嘴的速度系数φ=0.95，则喷嘴的能量损失系数为（）。
A．0.097 5
B．0.056 7
C．0.082 6
D．0.062 8
答案
参考答案：A
解析：
喷嘴的能量损失系数：
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喷嘴的速度系数φ=0.95，则喷嘴的能量损失系数为（）。
A．0.097 5
B．0.056 7
C．0.082 6
D．0.062 8
参考答案：A
解析：
喷嘴的能量损失系数：
Alice, Sonia and Bobby are looking at the employment section in their local newspaper.They are looking at advertisements for different types of jobs. “Why don’t you apply（申请）for the job as a waiter, Bobby?” said Alice. “Do you think I will have a chance?” Bobby replied. “Of course you will,” said Alice.“You’re certainly honest and reliable（可靠的）.Everyone trusts you, and you’re never late.” “I think Sonia should apply for the job as a nanny,” Bobby said. “Yes, Sonia,” Alice said.“You always work so hard and you love children.You would be perfect!” “I’d love to do it,” Sonia said, “but the advertisement says they want someone who is experienced.I don’t have any experience or qualifications.But what about you, Alice? “Yes, Alice,” Bobby said.“Which job would you like”? “I think I should become a career advisor!” said Alice. 根据图表内容，从A、B、C、D四个选项中选择最恰当的答案。 小题1:What does the underlined word “nanny” mean?
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