旋转轴轴径越大，它的旋转圆周线速度也越大，选用润滑油的黏度应（）。
A.大
B.小
C.越大
D.越小
参考答案：D
补全对话。
A: Shall we visit Monkey Island on Sunday?
B: I'd _____ (1) _____ (2). But _____ (3) can we go there?
A: By _____ (4). My father _____ (5) a very nice boat. We can use it.
B: That's great. I like to sit _____ (6) a boast. Is it _____ (7) enough?
A: Sure. It's not dangerous _____ (8) all.
B: What shall I_____ (9) with me?
A: Some food and water. We'll have a picnic _____ (10) the island.
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