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问题
单项选择题
对镍铬不锈钢铸件进行碱煮,所用氢氧化钾水溶液的浓度是()。
A.10%
B.20%
C.25%
D.30%
E.45%
答案
参考答案:
E
选择题
Read and choose. 选出与画线单词意思相反的单词。
( ) 1. It's
on
the first floor.
A. below
B. under
( ) 2. Oh, your schooll is
beautiful
.
A. ugly
B. agree
( ) 3. We have ten
new
computers!
A. old
B. older
( ) 4.
This
is the floor.
A. That
B. There
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填空题
液压系统中的开式油箱与()连通。
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