缩短传动链和在传动链中设置减速齿轮也可提高传动（）。
A.效率
B.速度
C.精度
D.效率、速度、精度
参考答案：C
—Sally, why do you want to buy a new skirt this weekend?
—Mom, the old skirt is ______ small for me. [ ]
A. too much
B. very much
C. much too
D. many too
判定心力衰竭代偿期的主要指标是（）
A.心脏扩大
B.心肌肥厚
C.心率加快
D.心排血量增加甚至接近正常
E.回心血量增加
