邮政通信生产必须要有集中(),才能确保邮政通信畅通无阻。
A、统一的通信秘密
B、统一的指挥调度
C、统一的通信纪律
D、统一的规章制度
参考答案:B, C, D
At the age of twenty Steve left his hometown, _____ to return without making his mark.
A.determining not
B.not determined
C.determined not
D.not determining
体质指数(BMI)计算公式是体重(千克)/身高(米)2,我国成年人BMI指数大于多少即可判为肥胖()
A.24kg/m2
B.26kg/m2
C.28kg/m2
D.30kg/m2