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【单选题】
下列说法正确的是( ) 1 生物的性状是由基因控制的,生物的性别是由性染色体上的基因控制的 2 属于XY型性别决定的生物,雄性体细胞中有XY,雌性体细胞中有XX 3 人类色盲基因b位于X染色体上,Y染色体上没有b,也没有B 4 女孩是色盲基因携带者,则该色盲基因一定是由她的父亲遗传来的 5 男人色盲基因不传儿子,只传女儿,但女儿通常不患色盲,却会生下患色盲的外孙,代与代之间出现不连续现象 6 色盲患者男性多于女性.
A.
①④⑤⑥
B.
①②③④
C.
②③⑤⑥
D.
①③④⑥
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Accounts receivable credited for 2,500 Sales revenue account debited for 2,500 GST clearing debited for 250
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Accounts receivable debited for 2,750 Sales revenue account credited for 2,500 GST clearing debited for 250
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Accounts receivable debited for 2,750 Sales revenue account credited for 2,500 GST clearing credited for 250
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A.
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B.
滑动摩擦
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滚柱导轨
B.
滚珠导轨
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滚针导轨
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卸荷导轨
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滚动轴承导轨
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【单选题】Plath is credited with advancing the genre of _________.
A.
confessional poetry
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novel
C.
drama
D.
religious poetry
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【单选题】在两导轨面之间放置滚动体,使导轨面之间具有滚动摩擦性质,这种导轨称为( )
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滚动导轨
B.
滑动导轨
C.
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D.
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【判断题】滚动导轨的摩擦比滑动导轨摩擦小。()
A.
正确
B.
错误
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【单选题】导轨面之间放置滚柱、滚珠，或滚针等滚动体，使导轨面之间的摩擦为()性质，这种导轨称为滚动导轨。
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【多选题】在滚动导轨中,用于承载能力大和刚度高的滚动导轨是 。
A.
滚柱导轨
B.
滚珠导轨
C.
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卸荷导轨
E.
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【单选题】Plath is credited with advancing the genre of _________.
A.
confessional poetry
B.
novel
C.
drama
D.
religious poetry
查看完整题目与答案
【单选题】在两导轨面之间放置滚动体,使导轨面之间具有滚动摩擦性质,这种导轨称为( )
A.
滚动导轨
B.
滑动导轨
C.
动压导轨
D.
静压导轨
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【判断题】滚动导轨的摩擦比滑动导轨摩擦小。()
A.
正确
B.
错误
查看完整题目与答案