饱和系数越大（）。
A.饱和深度越深
B.导通电阻越大
C.导通电流越大
D.导通压降越大
参考答案：A
.
He was feeling bad. He went to work, _______, and tried to fix his attention on it.
A．however
B．so
C．although
D．while
Please write me ____ you arrive in New York.
A．as well as
B．so long as
C．as far as
D．as soon as
