颈外静脉穿刺时，病人应采取何种卧位：（）
A、去枕平卧
B、头低足高
C、侧卧位
D、半坐卧位
参考答案：A
选择焊接电流应根据焊条类型和直径、（）等加以综合考虑。
A、焊件厚度
B、焊接位置
C、接头形式
D、坡口形式
Busy as Tom is, exercise has always been______his work.
A．as a part of his life much as
B．as much a part of his life as
C．as much as a part of his life
D．so much a part of his life as
