MRI检查的禁忌证不包括()
A.装有心脏起搏器者
B.装有铁磁性或电子耳蜗者
C.中枢神经系统的金属止血夹
D.体内有陶瓷置入物
E.体内有胰岛素泵
参考答案:D
已装于冷凝器管中的铜管如采用涡流探伤,应选用()探头.
A.扇形
B.穿过式
C.点式
D.内插式
It was not until she got home Jennifer realized she had lost her keys. [ ]
A. when
B. that
C. where
D. before