无缝钢管的规格一般由（）表示。
A、成品钢管的内径
B、成品钢管的外径
C、成品钢管的外径、壁厚和长度的公称尺寸
D、以上都对
参考答案：C
根据图片和中文提示，完成下面对话。
Zip: 1_________________________ Monkey?
Monkey: I like apples. They're 2. s______________.
Rabbit: I like fruit. 3_________________________ (但是我不喜欢葡萄，它们很酸。). Bananas are my
favourite. They're tasty.
Zip: I like carrot juice. 4_________________________ (它新鲜又有益健康。) What about you, Zoom?
Zoom: 5_________________________ (我喜欢牛肉), but I'm heavv now. I have to eat vegetables.
环磷酰胺在体内转化为活性最强的代谢物是（）
A.卡氮芥
B.磷酰胺氮芥
C.磷酰胺
D.丙烯醛
E.异环磷酰胺
