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【单选题】
提高离心泵抗汽蚀性能的措施是( )。A.
改进泵进口的结构参数
B.
合理设计吸入管路尺寸和安装高度
C.
提高出口压力
D.
A和B
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举一反三
【单选题】He doesn't dare to leave the house ______________ he should be recognized.
A.
in case
B.
if
C.
provided
D.
so that
【单选题】He doesn't dare to ask the teacher, _______ he?
A.
does
B.
doesn't
C.
daren't
D.
dare
【简答题】He doesn't dare to leave the house _____ he should be recognized. A) in case B) if C) provided D) so that
【单选题】I _____ go there alone, but he _____ go there by himself. [ ]
A.
dare; doesn't dare
B.
dare to; dares not
C.
dare; dare not
D.
dare to; doesn't dare
【单选题】.《信息通信建设工程预算定额》用于扩建工程时,其扩建施工降效部分的人工工日按乘以系数()计取。
A.
1
B.
1.1000000000000001
C.
1.2
D.
1.3
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