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【单选题】

薄壳山核桃亦可采用根插育苗,选用1-4年生实生苗粗度为1、5厘米的根,剪成1O厘米长,冬春扦插,成活率可达90%~100%亦可用( )等方法繁殖

A.
分蘖
B.
压条
C.
扦插
D.
分蘖、压条、扦插、嫁接
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【单选题】患者男性,63岁,因“腋下与腹股沟部位紧张性大疱2个月”而入院。体检:除腋下和腹股沟外,在胸腹部亦可见数个樱桃大小的大疱,基底略红,疱壁紧张,疱液澄清,尼氏征阴性。化验:皮损处直接免疫荧光检查发现基底膜带有IgG和C3呈线状沉积,诊断为大疱性类天疱疮。 患者实验室检查下列说法不正确的是

A.
组织病理检查示表皮下水疱
B.
电镜检查发现水疱位于透明板内
C.
直接免疫荧光检查在90%的患者可见IgG呈线状沉积于基底膜带
D.
盐裂皮肤检查可见IgG沉积在近表皮侧
E.
10%~80%的患者血清中有抗表皮基底膜带的循环抗体,其滴度与皮损严重程度及病情活动性之间有平行关系

【单选题】Less Is More It sounds all wrong-drilling holes in a piece of wood to make it more resistant to knocks. But it works because the energy from the blow gets distributed throughout the wood rather than ...

A.
A uniform substance doesn’t cope well with knocks because only a small proportion of the material is actually (8) . All the energy from the blow goes towards breaking the material in one or two places, but often the pieces left (9) are pristine (未经破坏的).
B.
But instead of the energy being concentrated in one place, the holes provide many weak spots that all absorb energy as they break, says Vincent. "You are controlling the places (10) the wood breaks, and it can then absorb more (11) , more safely. "
C.
The researchers believe the principle could be applied to any material- (12) example, to manufacture lighter and more protective packaging. It could (13) be used in car bumpers, crash barriers and arm our for military vehicles, says Ulrike Wegst, (14) the Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you (15) to design the substance with the direction of force in mind. "The direction of loading is crucial," she says.
相关题目:
【单选题】患者男性,63岁,因“腋下与腹股沟部位紧张性大疱2个月”而入院。体检:除腋下和腹股沟外,在胸腹部亦可见数个樱桃大小的大疱,基底略红,疱壁紧张,疱液澄清,尼氏征阴性。化验:皮损处直接免疫荧光检查发现基底膜带有IgG和C3呈线状沉积,诊断为大疱性类天疱疮。 患者实验室检查下列说法不正确的是
A.
组织病理检查示表皮下水疱
B.
电镜检查发现水疱位于透明板内
C.
直接免疫荧光检查在90%的患者可见IgG呈线状沉积于基底膜带
D.
盐裂皮肤检查可见IgG沉积在近表皮侧
E.
10%~80%的患者血清中有抗表皮基底膜带的循环抗体,其滴度与皮损严重程度及病情活动性之间有平行关系
【单选题】Less Is More It sounds all wrong-drilling holes in a piece of wood to make it more resistant to knocks. But it works because the energy from the blow gets distributed throughout the wood rather than ...
A.
A uniform substance doesn’t cope well with knocks because only a small proportion of the material is actually (8) . All the energy from the blow goes towards breaking the material in one or two places, but often the pieces left (9) are pristine (未经破坏的).
B.
But instead of the energy being concentrated in one place, the holes provide many weak spots that all absorb energy as they break, says Vincent. "You are controlling the places (10) the wood breaks, and it can then absorb more (11) , more safely. "
C.
The researchers believe the principle could be applied to any material- (12) example, to manufacture lighter and more protective packaging. It could (13) be used in car bumpers, crash barriers and arm our for military vehicles, says Ulrike Wegst, (14) the Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you (15) to design the substance with the direction of force in mind. "The direction of loading is crucial," she says.
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