After the negative feedback connection is adopted, the（）
A. closed-loop system must be stable
B. dynamic performance of the system will be improved
C. steady-state error finally be eliminated completely
D. structural parameters of the system need to be adjusted in order to improve the performance of the system
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Which of the following is an effective opening for a first inquiry（）
A. Please answer the following questions about your Web hosting services
B. My name is Jill Aubrey, and I am the office manager for Cape Consulting Inc
C. I recently read an article about your firm in the Cape Cod Times
D. Cape Consulting Inc. is the premier communication-consulting firm in the Cape and islands area
What are the targets of drug action（）
A. Recipient
B. ion channel
C. enzyme
D. Endogenous small molecular matter
In addition to being able to speed up target discovery, what is the other advantage of CADD（）
A. Increase drug targets
B. Improve the inclusion of targets
C. Find more targets
D. Improve the accuracy of target discovery
Which one is correct about system transfer function（）
A. Independent of the input signal and related to the system structure and parameters
B. It is related to input signal and system structure and parameters
C. Related to input signal, independent of system structure and parameters
D. It has nothing to do with system structure and is related to system parameters
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