未接种卡介苗的婴幼儿OT试验阳性,提示?()
A.重症营养不良;
B.机体反应较差;
C.需接种卡介苗;
D.患活动性结核病;
E.曾有结核菌感染。
参考答案:D
We have finally finished it! When the job if we had started it a week earlier?[ ]
A. may we finish
B. could we finish
C. could we have finished
D. may we have finished
γ射线是()从高能级跃迁到低能级时所放射的电磁波。
A.原子外层电子
B.原子外层中子
C.原子核
D.原子