皮带的宽度越大,托辊的()越大。
参考答案:间距
We play sports on school days. You know, we don't have enough time and have to do lots of homework.
A.often
B.usually
C.hardly
D.ever
营养不良患儿应用苯丙酸诺龙治疗,是因为其能够()
A.促进消化功能
B.促进食欲
C.促进糖原合成
D.促进蛋白质合成
E.增强机体免疫功能