疖的病变范围一般是()。
A.3cm
B.3~6cm
C.6~9cm
D.7~9cm
E.30cm
参考答案:A
若a=Array(1,2,3,4),则a(3)=()。
A.1
B.2
C.3
D.4
It doesn't matter____you fail the exam. Keep on studying hard, and then you will succeed in the end. [ ]
A. before
B. unless
C. if
D. until