制品表面有很长的针状白色如霜一般的细纹，这些细纹常形成“V”字形，尖端背向浇口，这种缺陷为（）
A、流痕
B、喷射流
C、银线痕
D、裂纹
参考答案：C
根据所给的情景补全对话。
A Good Friend
Robot: Hello! Boys and girls. I'm a 1_____________. I'm your good friend.
Ss: 2_____________ can you do?
Robot: I can see 3_____________ my eyes. I can 4_____________ with my ears. I can 5_____________
with my legs. I can 6_____________ with my hands.
Ss: 7_____________ you speak English?
Robot: 8_____________. But only a little.
Ss: Oh, good.
临床医学通常进行哪些方面的调查?其调查设计内容及方法如何?
