工件表面状态不好,需要对其表面进行无损探伤,最好的超声方法有:()。
A.表面波探伤
B.横波探伤
C.爬波探伤
D.都不是
参考答案:C
----What’s the matter with Timmy?
------His bike hit a rock and , which made him slightly hurt.
A.turned over
B.turned down
C.turned up
D.turned away
饮牛奶容易直接导致肥胖吗?