关于金属烤瓷全冠的牙体制备，不正确的是（） A.前牙应制备与牙长轴成40°的切斜面

短文改错。

Dear Susan, I'm very glad to hearing you are coming to visit         me the next Friday. Unfortunately, I won't be able to                    meet you at the airport although I have classes in the                    afternoon. You won't find difficult to get to the city                     center. The airport bus leaves every 30 minute and                      will take you rightly to the Friendship Hotel. My class                   will be over by then or I will pick you up there. I will                    take you together to a hot-pot restaurant for dinner                    and we'll talk with our plan for the weekend over                       dinner. Having a pleasant trip and see you Friday.                    1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. _____

以下说法正确的是（　　）

A．固体在熔化成液体的过程中，温度一定升高

B．研究物体的运动时，一定要选择地面静止的物体为参照物

C．人耳也能听到火山爆发和地震时产生的次声波

D．液体的压强与液体的密度和深度有关

下列不属于特权指令的是( )。

A．访管指令

B．设置时钟

C．清内存

D．设置中断屏蔽

肺结核分型不正确的是（）

A.原发性肺结核：Ⅰ型肺结核

B.浸润型肺结核：Ⅲ型肺结核

C.Ⅱ～Ⅴ型均为继发性肺结核

D.干酪性肺炎：Ⅱ型肺结核

E.结核性胸膜炎：Ⅴ型肺结核

已知A、B土样的土工试验结果见表，试问下列结论中哪几个是正确的

题1-64表 土样 wL wP w(%) ds Sr A 30 12.5 28 2.75 1.0 B 14 6.3 26 2.70 1.0

(1)A土样比月土样的黏粒(d＜0.005mm)含量多；
(2)A土样重度大于月土样；
(3)A土样干密度大于月土样；
(4)A土样孔隙率大于B土样。