According to the passage, "weight" should be understood in the sense that

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:15:27 免费下载:《单选题》Word试卷

According to the passage, "weight" should be understood in the sense that
A.it is fixed if it is outside the earth's gravitational pull.
B.it decreases four times when it is 4,000 miles from the earth's center.
C.it varies with the change of the gravitational attraction between two objects.
D.things increase in amount as they are closer to the earth's surface.

本题关键词:BE值,T管,t-PA,T形,T波,T株,头颅T,S-T段,RAEB-t症,T形管;