扑救( )火灾时，比水轻又不溶于水的液体用直流水、雾状水灭火往往无效，可用普通蛋白

下列不是第一恒磨牙正常萌出的影响因素的是（）

A.第一恒磨牙的位置

B.下颌骨的大小

C.第二恒磨牙的方向

D.第二乳磨牙的末端平面

E.第二乳磨牙严重龋坏

下列哪一项不是防护罩所要实现的功能.()

A.使人体不能进入危险区

B.阻挡高速飞向人体的外来物

C.使设备安装牢固

D.ABC都不是

粗加工时应选较（）的前角。

定时限过流保护的特点是什么？

When most people refer to multimedia, they generally mean the combination of two or more continuous media, usually with some user (115) . In practice, the two media are normally audio and video, this is, (116) plus moving (117) .
It should be’ obvious by now that transmitting multimedia material in uncompressed form is completely out of (118) . The only hope is that massive compression is possible. Fortunately, a large body of research over the past few decades has led to many compression techniques and algorithms that make multimedia transmission (119) .

A．impossible

B．fearful

C．feasible

D．program

E．question

F．ting