若咽部有灰白色伪膜，坚韧不易剥离，重剥则出血，或剥去随即复生，此属重证，多为（）。
A.口疮
B.口糜
C.鹅口疮
D.白喉
E.乳蛾
参考答案：D
"_____ you've made! But you should work still harder," Dad said to me.[ ]
A. What big mistake
B. How big mistakes
C. What great progress
D. How great progress
镇流器它有功率损耗吗？
great progress