埋弧焊控制箱为380/220电源，操作人有触电的危险（）.
参考答案：对
______时，肱二头肌舒张，肱三头肌收缩．
—Will you come to dinner?
—I will come if I ________. [ ]
A. invite
B. will invite
C. am invited
D. can invited
