单项选择题

回苏灵是: A.
直接兴奋呼吸中枢 B.
反射性兴奋呼吸中枢 C.
是A是B D.
非A非B

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球阀按照驱动方式分为气动球阀、电动球阀、手动球阀等。
A、正确
B、错误

答案：正确

单项选择题

For the simplest stationary source with memory, its output is just related to the only one previous symbol, then the source can be recorded as X_1X_2, which of the following relationship among H(X_1 X_2), H(X_1)+H(X_2), and 2H(X_1) ( )?
A、H(X_1X_2)<=H(X_1)+H(X_2)<=2H(X_1)
B、H(X_1)+H(X_2)<=H(X_1X_2)<=2H(X_1)
C、H(X_1X_2)<=2H(X_1)<=H(X_1)+H(X_2)
D、2H(X_1)<=H(X_1)+H(X_2)<=H(X_1X_2)