强子是一切参与()的粒子统称。()就是强子。
参考答案:强相互作用;质子和中子
—Will Mr. Green be able to see me at 10:00 ?
—Sorry, but he fully until 3:30 unless there's a cancellation.[ ]
A. has occupied
B. will occopy
C. is occupied
D. has been occupied
水是人体不可缺少的组成成分,约占成人体重的(),用以维持人体正常的生理活动。
A、3/5
B、1/2
C、4/5
D、2/3