8250除数寄存器的值用于确定通信波特率，它必须在8250初始化时预置。为此，应先把

---You were tired out after the mountain climbing, weren't you?

---Yes, ______. I could hardly rise to my feet.

A．not at all

B．not a little

C．not a bit

D．not really

压耳主要表现是恶心、呕吐。

浓缩蔬菜汁的可溶性固形物含量和原汁的可溶性固形物含量之比应不小于（）。_参见GB10789-2008《饮料通则》6.1表1

A.1

B.2

C.3

D.4

过热器顺流和逆流布置各有哪些优缺点？

铁路线路大、中修周期由（）决定。