窗形拘束试验时试件的坡口形状是（）形。
A、I
B、V
C、X
D、Y
参考答案：C
检测起动机的启动电流时，应将万用表打到直流电流挡并串入启动电路，检测时间应限制在5秒之内。
People throughout the world are eating ______ meat per person as they did in 1950. A. more than twice B. twice much as C. twice as muchD. twice more
