The twin brothers _ students. [ ]
A. are both
B. both are
C. are all
D. both is
答案:A
以下能正确定义且赋初值的语句是______。
A.intn1=n2=10;
B.charc=32;
C.floatf=f+1.1;
D.doublex=12.3E2.5;
变压器是由哪几部分构成?