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【判断题】
操作系统使PLC具有基本的智能,能够完成PLC设计者规定的各种工作.由PLC生产厂家设计并固化在只读存储器(ROM)中,用户能读取。A.
正确
B.
错误
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【简答题】The Bernoulli’s equation for a total flow can be expressed as .
【单选题】It's always difficult being in a foreign country, _______ if you don't speak the language. [ ]
A.
equally
B.
naturally
C.
basically
D.
especially
【单选题】The passage mainly tells us about ______.
A.
the brief history of women's fight for the equality with men
B.
the brief review on the problems about women's inequality in society
C.
the role of women in society
D.
the way to solve the problem of women's inequality in society
【单选题】Bernoulli’s equation can be derived from the conservation of （）
A.
energy
B.
mass
C.
volume
D.
pressure
【单选题】The total head of bernoulli's equation includes:
A.
elevation head, pressure head, velocity head
B.
elevation head, piezometer head, velocity head
C.
horizontal datum line, elevation head, velocity head
D.
horizontal datum line, pressure head, velocity head
【简答题】试求Bernoulli方程的积分因子．
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