变压器负荷率为（）时效率均较高。
A.0.1～1
B.0.2～1
C.0.3～1
D.0.5～1
参考答案：C
Can you provide us ______ some information _____ the computer?
A．for, for
B．with, with
C．with, about
D．about, with
试比较急性感染性心内膜炎与亚急性细菌性心内膜炎时赘生物的病变特点？
