肾结核晚期特征性X线表现为（）
A.肾积水
B.肾盂肾盏边缘性破坏
C.肾功能减退
D.肾自截
E.小膀胱
参考答案：D
请在横线上用恰当的化学用语表示：
（1）Fe3O4的名称______． （2）硫酸钠的化学式______．
（3）3个磷原子______． （4）镁离子符号______．
— Sorry, Professor Smith. I didn't finish the assignment yesterday.
— Oh, you _____ have done it as yesterday was the deadline. [ ]
A. must
B. mustn't
C. should
D. shouldn't
