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【单选题】
说,鸟巢的焰火燃放是不能掉下一颗火星的,攻克一个难关,有时要做上百次实验。观众看到的是五光十色的绚丽,但背后的艰辛劳动,中间的复杂程度,是很多人不到的。这表明() (1)人们可以感知现象,但未必认识本质 (2)本质总是隐藏在事物背后,要通过科学思维来把握 (3)本质是人脑对客观事物作出的如实反映 (4)认识事物不仅要看现象,而且要看本质
A.
A(1)(2)(3)
B.
B(1)(2)(3)(4)
C.
C(1)(3)
D.
D(1)(2)(4)
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A.
did
B.
that
C.
that did
D.
did that
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A.
排气行程上止点
B.
排气行程下止点
C.
做功行程下止点
D.
进气行程下止点
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A.
正确
B.
错误
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A.
so tha t
B.
if
C.
when
D.
unless
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