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【单选题】
在锉削加工余量较小,或者在修正尺寸时,应采用()。A.
顺向锉法
B.
交叉锉法
C.
推锉法
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【单选题】釉质中羟磷灰石晶体的分子式是
A.
Ca6(PO4)2(OH)10
B.
Ca4(PO4)6(OH)10
C.
Ca6(PO4)10(OH)2
D.
Ca10(PO4)6(OH)2
E.
Ca110(PO4)2(OH)6
【单选题】已知NaH 2 PO 4 溶液呈酸性，在水溶液中存在如下水解平衡：H 2 PO - 4 +H 2 O H 3 PO 4 +OH - ，现将0.1 mol·L -1 NaH 2 PO 4 溶液稀释后，增大的是( )
A.
［H + ］
B.
［OH - ］
C.
［ ］
D.
K W
【多选题】下列关于牛津大学的说法哪些是正确的?
A.
Oxford University is the oldest university in England.
B.
Its most famous college is Christ Church College.
C.
The university is made up of 38 separate colleges and 6 private halls.
D.
It's famous for the dining hall in the Star Wars films.
【简答题】Po: uh oh~~ahhhh~~~~ ohhhhh~ What's going on ... Where I am ... What are you 1) ... oh ... ok ... sorry ... I just wanted to see who the dragon warrior was. Wugui: How interesting tigeree: are ...
【简答题】牙齿的损坏实际是牙釉质[Ca 5 （PO 4 ） 3 OH]溶解的结果，在口腔中存在如下平衡：Ca 5 （PO 4 ） 3 OH?5Ca 2+ +3PO 4 3- +OH - 当糖附在牙齿上发酵时会产生H + ，试运用化学平衡理论说明经常吃糖对牙齿的影响．
【单选题】釉质中羟磷灰石晶体的分子式是
A.
Ca6(PO4)2(OH)10
B.
Ca2(PO4)6(OH)10
C.
Ca6(PO4)10(OH)2
D.
Ca10(PO4)6(OH)2
E.
Ca10(PO4)2(OH)6
【单选题】听力原文：W: Oh, Professor Jackson, I was wondering well, Oh,...well, if uh...if you have a chance yet to look at my thesis proposal． M: Well, I know you gave it to me over a week ago, but to be honest, I ...
A.
He means that he didn't know the thesis proposal.
B.
He means that he hasn't have time to read the proposal.
C.
He means that he will not help her read the proposal.
D.
He means that she'd have given it to him earlier.
【简答题】（3分）牙齿的损坏实际是牙釉质[Ca 5 （PO 4 ） 3 OH]溶解的结果，在口腔中存在如下平衡：Ca 5 （PO 4 ） 3 OH 5Ca 2 ＋ +3PO 4 3― +OH ― 当糖附在牙齿上发酵时会产生H ＋ ，试运用化学平衡理论说明经常吃糖对牙齿的影响。
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