特大工件要求经过一次吊装、校准,就能完成整个工件的划线,因此,一般采用()进行划线。
A.拉线与吊线法
B.直接和零件法
C.在三坐标划线机上
D.平台划线
参考答案:A
—My grandmother died last night. I'm very sad about it.
—________. [ ]
A. You' re welcome
B. That's right
C. I 'm very sorry to hear that
D. I hope you 'll feel better soon.
心脏本身的供应血管是()
A.头臂干
B.左右颈总动脉
C.左右锁骨下动脉
D.左右冠状动脉
E.胸主动脉