远动遥测用电流、电压变换器是将输入的（）量变换为输出的（）量。
参考答案：模拟；数字
粉刺分为（）。
A.开放性
B.黑头粉刺
C.封闭性
D.白头粉刺
He ______ in his English test paper last week. He was very satisfied with himself.[ ]
A. makes some mistakes
B. make a mistake
C. made many mistakes
D. made few mistakes
