与逆波兰式“abc*+-d*ef- -”对应的中缀表达式是()。
A. -(a*b+c-d*e-f)
B. -(a+b*c)-(d*e-f)
C. -(a+b*c-d*e-f)
D. -(a+b*c)*d-(e-f)
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下列经营者的行为不符合《消费者权益保护法》的要求的是:
A. 某百货商场所售物品价格实行当场协商,不再标明价格
B. 某服装厂在百货商场租赁柜台销售衣服,不穿商场工作服,而是显著表明自己的名称
C. 经营者无论是提供商品或者服务,应当如实出具相关凭证
D. 内衣商场柜台上方显著标明:特殊商品,一经售出,除因质量问题,概不退换
A Canadian researcher has discovered that sound travels (21) air more than one-half kilometer an hour slower than had been believed. The discovery has surprised many engineers and scientists who learned they had been (22) the wrong speed of sound for many years.The speed of sound in air had been (23) to be three-hundred-thirty-one-point-two-nine meters a second. But Doctor George Wong found, (24) accident, that the speed of sound is only three-hundred-thirty-one-point-one-three meters a second. That is a difference of about sixteen centimeters a second.Doctor Wong is a member of the National Research Council of Canada. He was studying ways to (25) exactly the sound created by microphones. One of his experiments (26) a number he could use to find the speed of sound. He was (27) to learn that the speed of sound was slower than scientists had thought.To explain the difference, Doctor Wong spent eighteen months (28) past test research on the speed of sound. He finally found the (29) of the difference. It was a mathematics mistake (30) in Nineteen-Forty-Two by physicist H-C Hardy.Doctor Wong’s (31) does not mean a big change for the science of sound. This is (32) Doctor Hardy and Doctor Wong measured the speed of sound for what is called" standard air".Standard air exists only (33) thought. It is a way for scientists to agree (34) the same speed of sound. (35) the air around us, standard air always has a temperature of zero degrees Celsius and the same atmospheric pressure (36) the air at sea level. Standard air always has same amounts of nitrogen, oxygen, carbon dioxide and (37) gases. And in standard air, the speed of sound does not change.The change in the new speed of sound is (38) small to affect the work of most sound scientists and engineers. But scientists say Doctor Wong’s discovery may (39) improve instruments (40) use the speed of sound to measure very short distances. 36().
A. Since
B. Like
C. For
D. Unlike
一个用例的基本获取包含以下步骤①~⑥,其正确的排序是()。 ①识别出该应用系统的所有参与者 ②定义所开发的应用系统的边界 ③用结构化的自然语言描述每个事件序列 ④确定并激发角色参与的业务活动及所完成的事件 ⑤去除重复的事件序列 ⑥对用例进行分析和重组
A. ①②⑤③④⑥
B. ①⑤③②④⑥
C. ②⑤①④③⑥
D. ②①④⑤③⑥
在传染病区使用口罩,符合要求的做法是
A. 口罩应遮住口部
B. 口罩潮湿应晾干再用
C. 脱下口罩后勿挂在胸前
D. 取下口罩后外面向外折叠
E. 污染的手只能触摸口罩的外面