题目内容：
某部队在山顶上进行炮弹射击训练，如图所示，炮台距地面高度AO为h，炮弹射击方向与水平面成45°。水平地面上有一目标区域，它的左端距0点的距离BO为s1，右端距0点的距离C0为s2。为了保证炮弹击中目标区域，炮弹初速度υo。应满足什么条件?（ ） 
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答案解析：
单选题：某部队在山顶上进行炮弹射击训练，如图所示，炮台距地面高度AO为h，炮弹射击方向与水平面成45°。水平地面上有一目标区域，
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- 题目类型：单选题
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Tomorrow's holiday: I ___________ go to work.
Tomorrow's holiday: I ___________ go to work.
维生素 D 缺乏性佝偻病活动期的主要表现为
维生素 D 缺乏性佝偻病活动期的主要表现为A．肌肉松弛 B．语言发育迟缓 C．骨骼系统的改变 D．低热、盗汗 E．突然惊厥或喉痉挛
I enclose details of
I enclose details of
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Complete the text by writing the verbs in brackets in the co
Complete the text by writing the verbs in brackets in the correct tense: past si