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解方程． ①3x-0.45×4=2.7 ②5.8x-4.6x=0.96 ③8.4÷（9-x）=3 ④3x÷1.2=8．
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【单选题】______ Ling Ling is tired, _______ she wants to have a rest.
A.
Because, so
B.
Why, because
C.
/, so
D.
So, because
【单选题】关于零件图,下面说法中,正确的是( )
A.
零件草图用徒手目测绘制而成
B.
零件草图的尺寸标准不必齐全
C.
一个零件表达方式，其确定原则是读图方便
D.
零件的破损缺陷必须在草图上画出
【单选题】—Is Ling Ling English? —No, she _____ English. She is Chinese. [ ]
A.
is
B.
isn't
C.
aren't
D.
are
【简答题】Soong Mei-ling was one of the most well-known Chinese women of the twentieth century. Mei-ling was born in Hainan in 1898, the youngest daughter of Charlie Soong. At the age of 8, she was sent to the ...
【简答题】关于零件图,下面说法中,正确的是( )。A. 4
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【单选题】关于零件图,下面说法中,正确的是( )
A.
零件草图用徒手目测绘制而成
B.
零件草图的尺寸标准不必齐全
C.
一个零件表达方式，其确定原则是读图方便
D.
零件的破损缺陷必须在草图上画出