测瓢偏度时,为什么要用两块表?
参考答案:
放置两块表的目的在于消除转子回转时,沿轴向移动引起的误差。
—You couldn’t have chosen any ________gift for me.
—I’m glad you like it so much.
A.bad
B.worse
C.nice
D.nicer
学科课程与活动课程有何区别