低压多级离心泵的平衡室由()、填料函体和平衡水管组成。
A.吸入段
B.中段
C.吐出段
D.导叶
参考答案:C
句子改错,下面各题划线部分中只有一处错误,请选出并改正。将选项的字母代号填入题前括号内,改正后的词写在右边的横线上。
( )1. This is his the best book .
A B C D
( )2. He is taller than any boy in his class.
( )3. Which do you like best , this one or that one?
( )4. Zhejiang is to the north of Fujian.
( )5. Kate draws best of her class.
按JJG702—2005《船舶液货计量舱容量检定规程》规定,容积大于或等于1000m³,规定的不确定度不大于();不规则舱检定的不确定度不大于().
A.0.3%,0.4%
B.0.2%,0.5%
C.0.2%,0.4%
D.0.4%,0.4%