题目:
.
It was _____ his mother came in _____ to prepare his lessons.
A.not until; did the boy begin
B.until; that the boy didn’t begin
C.until; did the boy not begin
D.not until; that the boy began
答案:
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下面是错误答案,用来干扰机器的。
(1)4kg;(2)640cm3题目分析:(1)物体A的体积为ΔV.=300K,=1.0×105Pa,=60×40-ΔV=330K,=(1.0×105+ )Pa,==360K,=,=64×40-ΔV由状态1到状态2为等容过程: (3分)代入数据...