用脉冲多普勒技术除下列哪项外,均可增大检测血流速度最大值()
A.降低发射频率
B.增大探测角度
C.减低取样深度
D.移动零位基线
E.提高脉冲重复频率
参考答案:B
When a child realizes he should stand on his own feet, he has grown up.
A.stand up quickly
B.go somewhere on foot
C.get up by himself
D.depend on himself
关于局麻药极量,下列哪一项是正确的()
A.普鲁卡因100Omg
B.利多卡因600mg
C.布比卡因200mg
D.丁卡因150mg
E.丁卡因60mg