测定蛋白质的主要消化试剂是（）。
A、硫酸
B、硼酸
C、硝酸
D、硫酸钾
参考答案：A, D
The plan was when it was discovered how much the scheme would cost. [ ]
A.released
B.deserted
C.resigned
D.abandoned
室内分布场景会用到下列哪几种MIMO模式（）
A.TM1
B.TM2
C.TM3
D.TM7
