— Is _______ OK, Lucy? — No, my maths is

对焊接缺欠的返工处理可采用碳弧气创、砂轮或其他机械方法清除，也可以采用电弧或气割火焰熔除。

筋的范围包括（）

A.关节囊

B.关节

C.关节软骨

D.肌腱

E.筋膜

电动往复泵排量不均匀的直接原因在于（）

A.活塞运动速度不均

B.转速太慢

C.液体的惯性力大

D.活塞作往复运动

如果价值系数大于1，说明产品或零部件的功能较大或成本较低，这是改进的目标。

W: Professor Clark suggested I get a tutor for advanced physics.
M: Well, that might help. Advanced physics is a pretty difficult course.
Q: What does the man mean().

A. Female students are unfit for studying physics.

B. He can serve as the woman’s tutor.

C. Physics is an important course at school.

D. The professor’s suggestion is constructive.