扣合零件的最佳预扣角度为（）度。
A.95-105
B.90-100
C.95-110
D.90-110
参考答案：A
In the past few years there _________great changes in my hometown .
A. have been B. were C. had been
监测心肌梗死的首选标志物是
A．ALTB．cTnC．CK-MBD．ALTE．LD
