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问题 单项选择题

浅基坑的支护中，适用于开挖较大、较浅(<5m)基坑，邻近有建筑物，不允许背面地基有下沉、位移时采用的是()。

A、型钢桩横挡板支撑

B、短桩横隔板支撑

C、挡土灌注桩支护

D、叠袋式挡墙支护

答案

参考答案：C

不定项选择

检定结束后，有关机构可以对该标准电表出具（）。

A.校准证书

B.测试证书

C.检定结果通知书

D.检定合格证
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单项选择题

A certain species of bird has two basic varieties, crested and noncrested. The birds, which generally live in flocks that contain only crested or only noncrested birds, tend to select mates of the same variety as themselves. However, if a bird that is raised in a flock in which all other members are crested is later moved to a mixed flock, then that bird—whether crested or noncrested—is likely to select a crested mate. This fact indicates that the birds’ preference for crested or noncrested mates is learned rather than genetically determined. Which one of the following, if true, provides the most support for the argument

A．Birds of other species also tend to show preferences for mates that have one or another specific physical feature.

B．In general there are few behavioral differences between the crested and noncrested birds of the species.

C．Both the crested and noncrested birds of the species tend to select mates that are similar to themselves in size and age.

D．If a crested bird of the species is raised in captivity apart form other birds and is later moved to a mixed flock, that bird is likely to select a crested mate.

E．(E) If a bird of the species is raised in a flock that contains both crested and noncrested birds, that bird shows no preference for one variety or the other in its selection of a mate.
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