诱变育种与杂交育种的不同之处是()①能大幅度改良某些性状 ②能形成新基因型 ③能形成

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问题:

诱变育种与杂交育种的不同之处是()①能大幅度改良某些性状 ②能形成新基因型 ③能形成新基因 ④需要大量的选育工作

A.①②

B.①③

C.②③

D.②④

考点:高中生物染色体变异与育种染色体变异与育种题库
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女,73岁,咳嗽伴咳痰1个月,近3天吸气性呼吸困难明显加重,不能平卧。听诊:胸骨位吸气性干鸣,否认异物吸入史。

该患者首先考虑的诊断是()。

A.支气管哮喘

B.支气管肺炎

C.气管内痰栓

D.支气管扩张

E.气管内肿物

题型:单项选择题

劳动关系运行中的突发事件,其实质是劳动关系领域中的()矛盾冲突。

A.社会

B.阶级

C.利益

D.劳资

题型:单项选择题

The old lady had always been proud of the great rose-tree in her garden, and was fond of telling how it had grown from a cutting she had brought years before from Italy, when she was first married. She and her husband had been travelling back in their carriage from Rome (it was before the time of railways) and on a bad piece of road south of Siena they had broken down, and had been forced to pass the night in a little house by the road-side. The accommodation was wretched of course; she had spent a sleepless night, and rising early had stood, wrapped up, at her window, with the cool air blowing on her face, to watch the dawn. She could still, after all these years, remember the blue mountains with the bright moon above them, and how a far-off town on one of the peaks had gradually grown whiter and whiter, till the moon faded, the mountains were touched with the pink of the rising sun, and suddenly the town was lit as by an illumination, one window after another catching and reflecting the sun’s beam, till at last the whole little city twinkled and sparkled up in the sky like a nest of stars.

题型:单项选择题

有价单证一律纳入______核算,并建立有价单证登记簿,按规定进行登记。

题型:单项选择题

桨叶的攻角由哪些因素决定()

1.直升机的下降率

2.直升机的飞行速度

3.桨叶的转速

4.桨叶的安装角

A.1、2、3

B.1、3

C.1、2、4

D.1、2、3、4

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