汽车硅整流发电机，常用的接插线有（）等。
A、F
B、E
C、+B
D、＋D
E、D-
参考答案：A, B, C
—What about the student in your class, Mr. Wang?
—The doctor said that ________ sleep caused him poor memory and poor concentration.
A．lacking of
B．lacked in
C．lacking
D．lack for
（25a2b2-10ab）÷5ab+32ab3÷（-4b）2．
