题目内容
(请给出正确答案)
[主观题]
Theybuiltthewallespeciallyhighsothatthelittleboycouldn’t______it.A.get on B.get
They built the wall especially high so that the little boy couldn’t ______ it.
A.get on
B.get up
C.get to
D.get over
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They built the wall especially high so that the little boy couldn’t ______ it.
A.get on
B.get up
C.get to
D.get over
第4题
A.离心式压缩机的喘振边界不会随着转速而发生变化
B.气体流量越大越容易发生喘振现象
C.可以通过增加流量的方法防止离心式压缩机进入喘振工况
D.喘振现象发生时,离心式压缩机振动加剧、噪声严重
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