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【简答题】
已知液体通过孔洞泄漏时质量速率为 ,根据下图推导液体通过圆柱形立式储罐孔洞泄漏时任何时刻 t 液体的质量流出速率和 容器流空到孔洞所在液面高度处所需要的时间的计算模型。 式中, A 为泄漏孔洞面积, m 2 ; C 0 为泄漏系数; 为液体密度, kg/m 3 ; g c 为重力常数; g 为重力加速度, 9.8m/s 2 ; P g 为储罐内表压, Pa ; h L 为储罐内液面与泄漏孔洞的液位差, m ; h L 0 为初始时刻储罐内液面与泄漏孔洞的液位差, m ; A t 为柱形储罐横截面积, m 2 。
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举一反三
【单选题】In paragraph 2, 'catch on' means______.
A.
become practical
B.
became popular
C.
became acceptable
D.
become creative
【单选题】He is always punctual and it is ________ for him to be late. [ ]
A.
common
B.
different
C.
rare
D.
unlikely
【单选题】In a rare display of self-criticism, he accepted blame for any mistake by the leadership and pledged to ______ them.
A.
rectify
B.
revise
C.
rewrite
D.
amend
【单选题】All the people ______ treatment protested that the medical fee was too high to be acceptable.
A.
of
B.
on
C.
with
D.
under
【单选题】What do people find about their rare ability to remember every detail of their life?
A.
It adds to the burden of their memory.
B.
It makes their life more complicated.
C.
It contributes to their success in life.
D.
It constitutes a rare object of envy.
【单选题】关于宋代宗教的发展情况,下列说法错误的是( )。
A.
两宋时期最为盛行的是禅宗南宗，该宗的创始人是惠能。
B.
北宋皇帝尊崇道教，以真宗、徽宗为甚。因此，道教的政治地位胜过佛教。
C.
摩尼教在宋代又称为明教。方腊起义即是以此来组织群众的。
D.
两宋时期，随着阿拉伯商人的到来，伊斯兰教开始传入中国，他们在广州、泉州等地建立清真寺，当时人多称“礼堂”“祀堂”“礼拜堂”。
【简答题】a)A credit stipulates that marine bills of lading are required and forwarder's B/Ls are acceptable. Whether the following bills of lading are acceptable? (1)( ) A B/L is issued by a forwarder and has...
【单选题】He transplanted the rare flowers to the botany garden_______it was the best time for them.
A.
where
B.
when
C.
until
D.
that
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