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【单选题】
柴油机转速保持不变，其它性能指标和参数随负荷的变化关系叫（）。A.
速度特性
B.
负荷特性
C.
油耗特性
D.
万有特性
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举一反三
【单选题】It's because he helped you ______ I'm ready to help him.
A.
why
B.
since
C.
so
D.
that
【单选题】听力原文：W: Are you being helped, sir? M: No, not yet. I'm trying to find a pair of shoes. You see, my feet are so big and it's difficult to get my size here. W: You've come to the right place, sir. Look,...
A.
A pair of trousers
B.
A pair of shoes
C.
A coat
D.
A dress
【单选题】Thank you for your help. If you___________us, I think we_________doing it now. [ ]
A.
hadn't helped; must have been busy
B.
didn't help; must have been busy
C.
hadn't helped; must be busy
D.
didn't help;must be busy
【多选题】管路中的压力损失将导致传动效率降低，油温升高，泄露增加，所以液压系统的管路应 ( )。
A.
缩短管路的长度。
B.
减少不必要的弯头
C.
限制流速
D.
减少不必要的管道截面突变
【单选题】当前，人文社会科学经济建设功能进一步为人们所认识的主要原因在于( )
A.
自然科学技术迅猛发展
B.
世界并不太平
C.
发达国家和发展中国家经济发展差距有进一步拉大的趋势
D.
“知识经济”时代开始到来
【单选题】It's ______ he helped you that I'm ready to help him.
A.
the reason
B.
for
C.
because
D.
since
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