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【单选题】
用显微镜观察玻片标本时，要经过以下几个操作步骤，其操作顺序正确是（ ） ①调节反光镜 ②转动转换器，使低倍物镜对准 ③将玻片标本放到载物台上 ④转动粗准焦螺旋使镜筒下降 ⑤转动粗准焦螺旋使镜筒缓慢上升 ⑥准焦螺旋调节出清晰的物像．A.
②①③④⑤⑥
B.
①②③④⑤⑥
C.
②①③⑤④⑥
D.
①②③⑤④⑥
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反馈参考答案：
举一反三
【单选题】The hardware address of a computer on a LAN can also be called a MAC address because ().
A.
Hardware address is the address used in the media access control layer when transmitting data.
B.
It is the address. MAC is the abbreviation of physical address.
C.
It is the physical layer address, and MAC is the abbreviation of the physical layer.
D.
It is the link layer address, and MAC is the abbreviation of link layer.
【简答题】语音震颤减弱或消失和增强分别常见于哪些情况？
【多选题】下列哪些选项与建设美丽中国相匹配？
A.
环境就是民生，青山就是美丽，蓝天也是幸福
B.
绿水青山就是金山银山
C.
保护环境就是保护生产力，改造自然就是发展生产力
D.
人因自然而生，人属于自然，而不是自然属于人
【单选题】If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?
A.
Discard it and send an error message back to the originating host
B.
Flood the network with the frame
C.
Add the source address and port to the MAC address table and forward the frame out the destination port
D.
Add the destination to the MAC address table and then forward the frame
【单选题】A socket is composed of two addresses:(72)。
A.
MAC address and IP address
B.
MAC address and port address
C.
port number and IP address
D.
E-mail address and IP address
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