建筑地面工程应严格控制各构造层的厚度，按设计要求铺设。灰土垫层厚度不应小于()。
A. 60mm
B. 80mm
C. 100mm
D. 120mm
According to the news, in 2007______.
A. the first leg of the new programme is to come
B. two robots will be sent to explore the surface of Earth' s neighbour
C. the Satellite Mars Reconnaissance Orbiter will circle the Red Planet while outfitted with a supercamera, capable of photographing objects the size of a football
D. SA plans to deploy a "Smart Lander"
木门窗拉手应位于门窗扇中线以下，门拉手距地面高度宜为()。
A. 800～1000mm
B. 850～1000mm
C. 900～1050mm
D. 900～1100mm
玻璃砖墙宜以()高为一个施工段，待下部施工段胶结材料达到设计强度后再进行上部施工。
A. 1m
B. 1.5m
C. 0.5m
D. 2m
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