A memory--memory, machine instruction for a certain machine has the following format. (Such an instruction is similar to a register—register instruction except that the operands are displaced addresses in memory.) Which of the following could be an assembly language instruction that would be translated into a memory—to—memory instruction for this machine（）.

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A memory--memory, machine instruction for a certain machine has the following format. (Such an instruction is similar to a register—register instruction except that the operands are displaced addresses in memory.) Which of the following could be an assembly language instruction that would be translated into a memory—to—memory instruction for this machine（）.
A.ADD 10（R1），20（R2） 
B.ADD（10R1），（20R2） 
C.ADD R1，10（R2），20 
D.ADD R1，10，20（R2）

本题关键词:僵a,ECF-A,EP21-A,EP6-A,EP18-A,EP7-A,Lp(a),Lp（a）,A-aDO2,抗A;