只能读出不能写入，但信息可以永久保存的存储器是（）。A、ROM B、RAM C、PR

垂直距离是指（）

A.上下颌牙槽嵴顶之间的距离

B.天然牙列呈正中位时面下1/3的高度

C.瞳孔连线到口裂间距离

D.息止颌位时、上下颌牙面间距离

E.鼻底到颏底间距离

2009年中 * * 办公厅、国务院办公厅印发的《关于实行党政领导干部问责的暂行规定》中所规定的对党政领导干部问责的方式不包括( )。

A．公开道歉
B．引咎辞职
C．责令辞职
D．免职

下列属于海关的权利的特点的是()

A、特定性

B、独立性

C、效力先定性

D、优益性 

Water is (41) important of all the things we (42) and drink. Not many people understand this, (43) it’s quite true. The human body (人体) can go (44) food for a long time, but two (45) three days without water can usually (46) people die.
Many people don’ t understand how much water the human body needs to work well and many people do not drink (47) , even (48) hot weather.
Our body is (49) water, about 65% to 75%, ff we do not have enough water, we’ll (50) tired and many will get ill. So you see, how important water is to us all.

[A] fall [B] fell[C] feel

晶振不好会导致以下哪些结果（）。

A、整罩分光特性超差

B、均匀性不好

C、表面不好

D、膜层牢固度不好