DTRU的功能包括()。
A、调制解调
B、支持2个TRX
C、载波合分路
D、完成速率适配、信道编码和交织、加密,产生TDMA突发脉冲
参考答案:A, B, D
Under a seller agreement,formal,written correspondence with the seller is required when______.
A.change to the project is issued
B.meeting with the seller's management is held
C.seller is asked for supporting information
D.there is a follow up to a conversation
过火石灰的危害主要表现在()。
A.消解速度过快
B.降低产浆量
C.降低水化温度
D.引起膨胀破坏