旋塞阀主要由()三部分组成。
(A)阀体、塞子、填料;
(B)阀体、阀杆、填料;
(C)阀杆、塞子、填料;
(D)阀体、阀杆、塞子
参考答案:A
-----Who has made a mess in my room?
-----Who else it but your naughty son?
A.could do
B.could have done
C.did
D.had done
下列程序段执行后的输出结果为 int x=3; int y=10; System.out. println(y %x) ;
A.0
B.1
C.2
D.3