Laura was away in Paris for over a week. When she got home, there was a pile of mail _______ for her.

A．waited

B．to wait

C．waiting

D．was waiting

血细胞计数中PLT计数最为困难，下列错误的是

A．PLT体积小

B．PLT在体外易于黏附

C．PLT在体外易于聚集

D．PLT数量多

E．PJT在体外易于变性破坏