圆锥齿轮减速器的润滑应使圆锥齿轮的浸入深度达到齿轮的()宽度。
A.1/2
B.1/3
C.整个
D.两个
参考答案:C
— Mum, it is nice weather.I want to skate this afternoon.
— Don't you think the ice on the lake is too thin to__________your weight?[ ]
A. carry
B. bear
C. catch
D. take
“尽道隋亡为此河,至今千里赖通波”皮日休诗中的“千里赖通波”是指大运河()
A.成为南北交通枢纽
B.有千里之长
C.起到防洪作用
D.发挥灌溉作用