等离子弧切割是用什么方法将电弧压缩为等离字弧?
参考答案:
机械压缩,热压缩,电磁压缩。
中国工程咨询协会的合同管理委员会编制的《工程咨询服务协议书试行本》,其附录C的内容为( )。
A.客户提供的职员、设备、设施和其他人员的服务
B.委托工程咨询服务范围
C.咨询服务报酬的计取方式
D.工程咨询单位提供的咨询服务内容
My parents expected too much of me. When they heard that I had failed in the college entrance
examination, they almost _____. [ ]
A. broke up
B. broke off
C. broke out
D. broke down