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【单选题】
关于同步检波器的说法，下列说法正确的是 。A.
相乘型同步检波器由相乘器和低通滤波器组成
B.
相乘型同步检波器由相加器和检波器组成
C.
叠加型同步检波器由相加器和低通滤波器组成
D.
叠加型同步检波器由相乘器和低通滤波器组成
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【简答题】It is really a happy thing to look back on the days I spent with Jennie. We met in night school. After Jennie and I had completed the required courses, we started teaching in the same school. For a ti...
【单选题】关于月经的临床表现,下列描述正确的为
A.
初潮的迟早与营养及体质强弱有关
B.
正常月经呈鲜红色，易凝固
C.
月经周期是指月经干净到下次月经来潮
D.
初潮的年龄大多数在18岁左右
E.
决定月经周期长短的是黄体期
【多选题】Jennie
A.
Seeing a friend
B.
Shopping
C.
Playing tennis
D.
Visiting the museum
E.
Seeing a film
F.
Watching TV
【多选题】Jennie has done in the conversation____
A.
Seeing a friend
B.
Shopping
C.
Playing tennis
D.
Visiting the museum
E.
Seeing a movie
F.
Watching TV
【单选题】The man doesn't want to call Jennie because
A.
he and Jennie argued recently.
B.
he heard Jennie did poorly on the last test.
C.
he doesn't want to bother Jennie so late in the evening.
D.
he'd rather study in his own dormitory.
【多选题】Listen and Choose Jennie——————
A.
Seeing a friend
B.
shopping
C.
playing tennis
D.
visiting the museum
E.
seeing a film
F.
watching TV
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