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【单选题】
佩戴口罩的做法中,下列哪些是不正确的?( )A.
.要将折面完全展开，将嘴、鼻、下颌完全，然后压紧鼻夹，使口罩与面部完全贴合
B.
戴口罩前要及时洗手，在戴口罩过程中避免手接触到口罩内面，以降低口罩被污染的可能
C.
要分清楚口罩的内外、上下，内面应该贴着口鼻，口罩浅色面为外面，深色面
D.
有金属条（鼻夹）的一端是口罩的上方。口罩不可内外面戴反，更不能两面轮流戴
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【简答题】● Networks can be interconnected by different devices. In the physical layer，networks can be connected by（1）or hubs，which just move the bits from one network to an identical network. One layer up we f...
【单选题】When multiple routers are used in interconnected networks,the routers exchange information about（）using a dynamic routing protocol
A.
destination addresses
B.
IP addresses
C.
work addresses
D.
router addresses
【单选题】Networks can be interconnected by different devices．In the physical layer，networks can be connected by(66)or Hubs, which just move the bits from one network to an identical net-work. One layer up we f...
A.
reapers
B.
relays
C.
connects
D.
modems
【简答题】●Networks can be interconnected by different devices．In the physical layer，networks can be connected by (66) or Hubs，which just move the bits from one network to an identical network．One layer up we f...
【单选题】Networks can be interconnected by different devices. In the physical layer networks can be connected by(31)or hubs, which just move the bits from one network to an identical network. One layer up we f...
A.
reapers
B.
relays
C.
packages
D.
modems
【单选题】关于Ia类抗心律失常药物药理作用叙述错误的是（ ）
A.
适度阻滞钠通道
B.
延长APD和ERP，延长ADP作用更明显
C.
降低膜反应性
D.
降低0相上升最大速率
E.
减少异位起搏细胞4相钠离子内流而降低自律性
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