氨合成生产强度的定义？
参考答案：氨合成生产强度是指单位时间内、单位体积催化剂上生成氨的量。
The storm________，they had to live in a cave．
A．has destroyed their hut
B．to destroy their hut
C．having destroyed their hut
D．destroying their hut
早期急性骨髓炎与软组织感染鉴别，下列哪项无意义
A．急性骨髓炎全身脓毒血症症状严重
B．急性骨髓炎始发于长骨干骺端
C．急性骨髓炎疼痛剧烈但压痛深在，表面红肿不明显
D．X线平片
E．分层穿刺
