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问题 解答题

白细胞有细胞核，成熟的红细胞和血小板没有细胞核．______（判断对错）

答案

血细胞包括红细胞、白细胞和血小板组成．红细胞．成熟的红细胞，无细胞核，是血细胞中数量最多的一种．白细胞无色，体积比红细胞大，有细胞核．血小板无核，又称血栓细胞，所以白细胞有细胞核，成熟的红细胞和血小板没有细胞核．

故答案为：√

单项选择题

Virtualization is an approach to IT that pools and shares (71) so that utilization is optimized and supplies automatically meet demand. Traditional IT environments are often silos, where both technology and human (72) are aligned around an application or business function. With a virtualized (73), people, processes, and technology are focused on meeting service levels, (74) is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization (75) that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

（71）处填（）。

A．advantages

B．resources

C．benefits

D．precedents
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单项选择题

关于脐带的特征正确的是（）

A.直径1.5～2.5cm

B.表面有羊膜覆盖呈灰白色

C.有2条脐静脉，1条脐动脉

D.妊娠足月脐带长20～40cm，平均约30cm

E.华通胶为含水量少，来自外胚层的胶样胚胎结缔组织
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