镗削加工时,应尽可能选用铸件毛坯上()的表面作为粗基准。
A.平整光洁
B.无明显缺陷
C.无夹渣砂眼
D.无浇冒口
E.无毛边
F.无毛刺
参考答案:A, D, E
----I’m leaving on April 30.
----So why not come to spend _____ days with me?
A.all these last few
B.these all last few
C.these last all few
D.all last these few
哪种细胞不是腺泡细胞癌的构成细胞()
A.空泡细胞
B.闰管样细胞
C.透明细胞
D.腺泡样细胞
E.肌上皮细胞