Only then()how much damage had been caused.
A. she realized
B. she had realized
C. had she realized
D. did she realize
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下列属于火灾探测器特级保护对象是()。
A. 易燃易爆场所
B. 人员密集场所
C. 严重危险性场所
D. 建筑高度超过100m的高层民用建筑
A sling is a device used in().
A. hoisting cargo aboard a vessel
B. hoisting personnel aboard a vessel
C. securing a small boat to a large vessel
D. hoisting the anchor