外呼吸功能障碍引起的缺氧，最具特征性的变化是A．动脉血氧分压降低 B．血氧容量降低

To forbid the cheating strictly in this important exam, the authorities have released a rule that students _________ bring any reference books and stationery into their classrooms.

A．will not

B．shall not

C．might not

D．need not

Helen always helps her even though going to school ________ most of her day.[ ]

A．turns up        

B．makes up      

C．saves up      

D．takes up

焦炭按粒度大小分级为（）或（）几种。

按刀具的用途及加工方法分类成型车刀属于（）类型。

A．拉刀

B．切刀

C．螺纹刀具

D．齿轮刀具

全口义齿，排后在抬架上调整平衡，应注意事项（）

A．做前伸调整

B．做侧向整

C．做单向侧调整

D．做垂直向调整

E．做正中调整