下列哪一种工作环境是适合进行电焊?
A.空气流通及干爽
B.密闭空间
C.炎热而潮湿
参考答案：A
Take care! Accidents _________ happen along this part of the road.
A．will
B．would
C．must
D．Shall
试述超声探伤的特点是什么？
