题目内容
（请给出正确答案）
氟化物治疗牙本质过敏的作用机制是
A．堵塞牙本质小管，增加牙本质的硬度和抗酸，抗溶性
B．诱导修复性牙本质的形成
C．为蛋白沉淀剂，还原后沉积于牙本质小管堵塞小管
D．高热效应使牙本质表面变性和无机物熔融
E．刺激牙本质细胞形成修复性牙本质，较强持久的杀菌作用
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更多“氟化物治疗牙本质过敏的作用机制是A．堵塞牙本质小管，增加牙本…”相关的问题
第1题
—Susan is absent from today’s writing class.
-- ？ As far as I know, she has never missed a class.
A. How come
B So what
C Why
D What for
第2题
A．after class
B．during office hours
C．before class
D．a week in advance
第4题
Try not to be absent ________ class again for the rest of the term.
A．in
B．on
C．from
D．of
第5题
Try not to be absent ______ class again for the rest of the term.
A) from B) on C) in D) of
第6题
James: Can I borrow your notes for today's geology class？ Jane: ______
A．How dare you! Geology test is tomorrow.
B．I'd love to, but you can't have them.
C．How come that you didn't have notes for today's class？
D．Sorry, but I have to review them for tomorrow's test.
第7题
It was Tom ______was absent from class yesterday.
A．which
B．/
C．that
D．he
第8题
James: Can I borrow your notes for today's geology class？ Jane: ______.
A．How dare you. Geology test is tomorrow.
B．I'd love to, but you can't have them.
C．How come that you didn't have notes for today's class？
D．Sorry, but I have to review them for tomorrow's test.
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