皮皮学，免费搜题
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搜题
【单选题】
在锅炉水位自动控制系统中，当锅炉负荷突然变化后，为使水位能最终稳定在给定值上，控制系统最好采用______。A.
比例调节器
B.
PD调节器
C.
PI调节器
D.
PID调节器
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】We learn from the text that twenty years ago, Christine______.
A.
started her hobby by collecting magazines
B.
had a lot of girlfriends visiting her
C.
was worried about her marriage
D.
was in an unhappy marriage
【简答题】How to identify large numbers in listening pratice?
【单选题】The teacher told me to pay more attention_______ my pronunciation, so I made a_______ to pratice it every day.
A.
to, decision
B.
to, idea
C.
at, plan
D.
for, feeling
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