皮皮学，免费搜题
登录
搜题
【单选题】
氩弧焊采用直流反接时，（）。A.
焊件金属受电子高速冲击熔化慢
B.
钨极受电子高速冲击，造成钨极温度高，损耗快。
C.
没有阴极破碎作用
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Luis: Ana Pedroso works for Silica, ________________ ? Chris: Yes, she works in the design department.2. Luis: Your company has customers in Brazil, ________________ ?Chris: Yes, Silica has a lot of c...
【简答题】硬件组态的任务就是在STEP7中生成一个与（）完全相同的系统。
【单选题】—May I speak to Mr Brown? —_____. I'll go and get him. [ ]
A.
Speaking
B.
Wrong number
C.
Hold on, please
D.
Yes, I am
【单选题】It's very important _____ him _____ the violin very well. [ ]
A.
of, to play
B.
for, to play
C.
of, plays
D.
for, plays
【简答题】Choose the best answer for each blank 1. She has to __________ her passport before a trip to South Africa since it will expire next month. A. revise B. retract C. review D. renew 2. As the only...
【单选题】The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a（）.
A.
string
B.
stand
C.
joint
D.
standpipe
【简答题】硬件组态的任务就是在STEP7中生成一个与（ [填空(1)] ）完全相同的系统。
相关题目：