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【单选题】
变频器的三种常见控制，（）控制动态性能最好的控制方式。A.
U/f比例控制
B.
脉宽控制
C.
矢量控制
D.
转差频率控制
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列关于建设工程监理规划的说法,错误的是( ).
A.
监理规划在监理单位接受业主委托并签订委托监理合同后编制
B.
监理规划由总监理工程师批准实施
C.
监理规划的内容比监理大纲更详实、更全面
D.
监理规划是监理单位重要的存档资料
【单选题】What does BP Debate stand for?
A.
American Parliamentary Debate
B.
British Parliamentary Debate
C.
Best Presence Debate
D.
All Asian Debate
【单选题】—How was the televised debate last night? —Super!Rarely so much media attention．
A.
a debate attracted
B.
did a debate attract
C.
a debate did attract
D.
attracted a debate
【单选题】When preparing a debate, one should not _______.
A.
m ake an outline
B.
t hink from both sides
C.
b e objective
D.
m ake a draft for oral delivery
【单选题】—How was the televised debate last night? —Super! Rarely______so much attention.
A.
a debate attracted
B.
did a debate attract
C.
a debate attract
D.
attracted a debate
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