影响药物制剂稳定性的外界因素为（）
A.温度
B.离子强度
C.pH
D.溶剂
E.表面活性剂
参考答案：A
The split between humans and living apes is thought by some scholars ____ 15 to 20 million years ago.[ ]
A. to occur
B. occurring
C. to have occurred
D. having occurred
下列那种接地属于工作接地。（）
A、变压器中性点接地
B、互感器二次侧接地
C、电器设备外壳接地
D、零线接地
and living apes is thought by some scholars ____ 15 to 20 million years ago.[ ]