问题
单项选择题
四氢硼钠可用( )检识
A．二氢黄酮
B．黄酮苷
C．3-羟基黄酮和5-羟基黄酮
D．查耳酮
E．邻二酚羟基黄酮
答案
参考答案：A
解析：[知识点] 黄酮类化合物的显色反应
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四氢硼钠可用( )检识
A．二氢黄酮
B．黄酮苷
C．3-羟基黄酮和5-羟基黄酮
D．查耳酮
E．邻二酚羟基黄酮
参考答案：A
解析：[知识点] 黄酮类化合物的显色反应
| 35．Applications put computers to pratical business (1) , but below the (2) it’s the heart of an operating system—the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store (3) . A traditional kernal provides all the functions for applications. The kemal (4) memory, I/O devices and parcels out processor time. The kernel also supports security and fault (5) , which is the ablity to recover automatically when parts of the system fail. |
(5)
A．addition
B．combination
C．difference
D．condition