急性心肌梗死判断梗塞面积的是（）
A.肌红蛋白
B.CK
C.凝血四项
D.99mTC-焦磷酸盐
E.99mTC-MIBI
参考答案：B
________ for the fact that she broke her leg, she might have passed the exam.
A．Hadn’t it been
B．Had it not been
C．Was it not
D．Were it not
稳压二极管的符号是（）。
A.
B.
C.
D.
