不受植物性神经支配的器官是 [ ]
A．肱三头肌
B．心脏
C．胃
D．胰腺
答案：A
She said she had some trouble _____ her homework.[ ]
A. finish
B. finishing
C. to finish
D. finished
不属于电熔熔接机开机设置参数的是（）。
A、环境温度
B、焊机型号
C、焊接时间
D、电源
