目前,分类主题一体化检索语言有四种模式:()、()、()及()。
参考答案:分面叙词表;叙词表式索引;分类表—叙词表对照索引;集成叙词表
某基坑深10m,土层分布0~2.0m填土;2~20m为中砂;20m以下为黏土,地下水在地表下2.0m,含水层平均渗透系数k=1.0m/d,基坑等效半径r0=10m,降水影响半径R=76m,要求地下水位降到基坑底以下0.5m,井点深20m,基坑远离边界,不考虑周边水体影响,基坑降水的涌水量接近()。
A.300m3/d
B.322m3/d
C.342m3/d
D.362m3/d
When joining the female coupling of the fire hose to the male outlet of the hydrant,you should make sure that the().
A.threads are lubricated
B.nozzle is attached to the hose
C.female coupling has a gasket
D.hose is led out