The socks are very cheap (便宜). I'll _____ them.[ ]
A. take
B. bring
C. like
D. buys
答案:A
分泌血管活性物质的是
A."铅管"征B."鹅卵石"征C."鸟嘴"征D."杯口"征E.充盈缺损
变速箱副轴上各齿轮之转速关系为()
A.大齿轮转速高,小齿轮转速低
B.小齿轮转速高,大齿轮转速低
C.一样
D.依档数而定