面铣刀的主偏角影响刀尖强度、散热性能及轴向分力大小。故在工艺系统刚度允许的条件下，尽可能取（）值，一般可取45º～75º。
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Only then（）how much damage had been caused.
A. she realized
B. she had realized
C. had she realized
D. did she realize
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
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