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【单选题】
蝗虫的口器类型属于A.
咀嚼式口器
B.
刺吸式口器
C.
虹吸式口器
D.
撕咬式口器
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反馈参考答案：
举一反三
【简答题】They were unable to think of an alternative ____ selling an equity stake.
【单选题】以下电力电子器件中既是全控型器件又是电压驱动型的器件是
A.
IGBT , GTO
B.
电力 MOSFET , GTR
C.
IGBT , 电力 MOSFET
D.
GTO , GTR
【简答题】They didn't have a contingency plan, so they were unable to act.If they ___________ a contingency plan, they ____________________.
【单选题】They were unable to prove that he died as a direct result of the ______ from his doctor.
A.
injection
B.
ability
C.
prosperity
D.
definition
【简答题】画出下列电力电子器件电气图形符号,并按照电压驱动型器件、电流驱动型器件进行分类。说明容量最大的是什么?工作频率最高的是什么? 电力二极管(power diode)、晶闸管(SCR)、门极可关断晶闸管(GTO)、电力晶体管(GTR)、电力场效应晶体管(power MOSFET)、绝缘栅双极晶体管(IGBT)
【单选题】They were unable to ______ an explanation as to why an injury to one side of the head affected the opposite side of the body
A.
devise
B.
device
C.
decent
D.
revise
【单选题】From the last two paragraphs, it can be inferred that ______.
A.
once you become an alcoholic you can never quit drinking
B.
you can easily abstain from drinking once you make up your mind
C.
to abstain from drinking, one needs not only medical treatment but also personal determination
D.
a brief stay in the hospital can help one quit drinking
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