不同品种的水泥不得混合使用。
参考答案：对
RII中，In标记抗体成人常用注射剂量是（）。
A.74～111MBq
B.111～185MBq
C.185～370MBq
D.370～555MBq
E.555～740MBq
The rest of the students _____ not allowed to leave the classroom at that time. [ ]
A. are
B. have
C. was
D. were
