-What was she angry ?
-The broken glass. [ ]
A. with
B. to
C. about
D. over
答案:C
“负3的6次幂”写作______.-52读作______,平方得9的数是______.
不稳定型心绞痛在临床上可分为()
A.极低危
B.低危组
C.极高危
D.高危组
E.中危组