总效用和边际效用的关系是当边际效用为零时,()、当边际效用为负时,总效用递减和当边际效用为正时,()
参考答案:总效用最大;总效用递增
某同学用游标卡尺测量一圆柱体的长度,用螺旋测微器测量该圆柱体的直径,示数如图。由图可读出= cm, =
——I can’t _______ another task, now I have more than I can do.
—— In this way, I will ask someone else.
A.take on
B.take over
C.take up
D.take off