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【单选题】
关于牙本质龋,以下哪项是错误的A.
与釉质龋相比，其发展较快
B.
常形成一底向内，顶向外并稍圆突的三角形病损
C.
细菌侵入时可沿牙本质小管侧支扩张
D.
最先侵入的细菌可能是产酸菌
E.
牙髓牙本质复合体的防御性反应可形成修复性牙本质
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反馈参考答案：
举一反三
【简答题】y'(t)＋2y’(t)＋2y(t)=f(t)，y(0_)=0，y’(0_)=1，f(t)=u(t)
【单选题】How can the companies cut their cost according to the passage?
A.
They dismiss some employees to save money.
B.
They use temporary labors and cheap labors.
C.
They don't pay for the employees' health insurance.
D.
They invest money on marketing campaigns.
【单选题】They can’t dismiss you just like that. They have to give you a written _____ first.
A.
example
B.
invitation
C.
warning
D.
requirement
【单选题】乙型肝炎病毒是威胁输血安全的主要病毒之一，原因是( )。
A.
乙肝病毒抵抗力强
B.
感染后造成肝脏损伤
C.
普通人群中乙肝感染率很高
D.
乙肝可以转化为肝硬化和肝癌
E.
乙肝病毒为DNA病毒
【单选题】How can the Companies cut their cost according to the passage?
A.
They dismiss some employees to save money.
B.
They use temporary labors and cheap labors.
C.
They refuse to pay for the employees' health insurance.
D.
They invest money on marketing campaigns.
【单选题】How can the companies cut their cost according to the passage?
A.
They dismiss some employees to save money.
B.
They use temporary labors and cheap labors.
C.
They refuse to pay for the employees' health insurance.
D.
They invest money on marketing campaigns.
【简答题】(由于惊奇、气愤或者激动)呼喊,惊叫
【简答题】记∇为差分算子,则下列不正确的是( )。 A 12-∇-∇=∇t t t Y Y Y B2122--+-=∇t t t t Y Y Y Y C k t t t k Y Y Y --=∇ D t t t t Y X Y X ∇+∇=+∇)
【简答题】完成对话。 A: _______ me, Bill. Can you _______ me? I can't find _______ pencil. B: Isn't it _______ your bag? A: No, it _______. B: Please look _______ it under the desk. A: Oh, it is over there. Thank yo...
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