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【单选题】
半导体型探测器属于( )。A.
可燃气体探测器
B.
感光探测器
C.
感烟探测器
D.
光辐射探测器
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反馈参考答案：
举一反三
【简答题】变频器,按滤波方式不同可分为电压型和________型两种
【单选题】The school offers a ________ of extracurricular activities.
A.
various
B.
variety
C.
vary
D.
kind
【单选题】The school offers a variety of extracurricular activities .
A.
homework you do after class
B.
activities that are not part of the usual school course
C.
interesting and difficult assignments that take extra hours
【简答题】变频器，按滤波方式不同可分为电压型和（）型两种。A. 电流
【单选题】Rowan was listed in the top 50 ____ people ever by a group of comedians
A.
funny
B.
funnier
C.
funniest
D.
the funniest
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