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【单选题】
关于细菌菌的叙述,错误的是 ?A.
比鞭毛短
B.
无运动性
C.
无抗原性
D.
与致病性有关
E.
性菌传输遗传物质
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反馈参考答案：
举一反三
【单选题】What does the woman say about the supermarket?
A.
She doesn' t know its hours.
B.
She thinks it closes at 6:30.
C.
It' s open all night during Christmas.
D.
It isn' t open on Saturdays.
【单选题】--- Does anyone know _______ girl with a book in her hand over there? ---I’m afraid no one knows.
A.
the
B.
a
C.
an
D.
/
【简答题】(12分)图示的轮系中,已知各标准齿轮的齿数Z 1 =20, Z 2 =40, Z 2' =15, Z 3 =60, Z 3' =18, Z 4 =18, Z 7 =20, 齿轮3和7的模数m=3mm, 蜗杆头数为1,蜗轮齿数Z 6 =40。齿轮1为主动轮,转速n 1 =100r/min。 (1) 由图知蜗杆的旋向为____________,则蜗轮的旋向为___________; (2) 若使轴I...
【判断题】文字图层不同于普通图层,如果希望对文字图层执行诸如绘画、调整色彩与色调、应用大多数滤镜等操作,需要先将文字图层栅格化,即将其转换为普通图层。( )
A.
正确
B.
错误
【单选题】Why does the man go to the learning resource center?
A.
He wants to know where to register to take a test.
B.
He is looking for a quiet place to study.
C.
He needs help in improving his study skills.
D.
He would like to find a tutor to help him study.
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