单选题:What does Ron Arkin think of WL-16?

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题目内容:
What does Ron Arkin think of WL-16? A.He doesn't think it is usefu
B.He thinks it is only a manipulato
C.He is unsure of its safet
D.He thinks it is user-friendl
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答案解析:

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对玻璃的外观质量的表述,正确的是( )。A.钢化玻璃不允许存在爆边、裂纹,允许有轻微的划伤、结石等缺陷 B.夹层玻璃不允许存在裂纹、脱胶等缺陷,允许有轻微的爆边

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防止远中游离端义齿翘动的卡环是(  )。

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