What does Liu Xiang worry about spending too much time on discussion in class?
A. He is scared of making mistakes.
B. He may not be able to think deeply.
C. Other students may not be well-prepared.
D. Too many students speak at the same time.
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干粉灭火系统喷嘴的单孔直径不得小于（ ）mm。
A. 6
B. 10
C. 15
D. 20
预制式灭火装置干粉灭火剂储存量不应大于（ ）kg。
A. 50
B. 100
C. 150
D. 200
干粉系统灭火剂储存装置包括下列（ ）组件。
A. 储存容器
B. 容器阀
C. 安全泄压装置
D. 驱动气体储瓶
E. 集流管
糖酵解的限速酶是 。
A. 己糖激酶
B. 磷酸果糖激酶
C. 丙酮酸激酶
D. 醛缩酶
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