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【单选题】
以下不属于容积式空气压缩机试运行选项的是( )A.
检查各级气缸上、下余隙是否到规定要求。
B.
润滑油系统试车合格，保证润滑系统正常工作。
C.
水冷却系统试压符合要求，能使压缩机正常运行
D.
各级节流阀校验，其动作灵敏可靠
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举一反三
【单选题】On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）
A.
The destination host sends a request to the source for retransmission.
B.
The jam signal indicates that the collision has been cleared.
C.
The hosts will attempt to resume transmission after a time delay has expired.
D.
An electrical pulse indicates that the collision has cleared.
E.
The router on the segment will signal that the collision has cleared.
F.
The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
【单选题】在pH＝0的无色透明溶液中，因发生氧化还原反应而不能大量共存的离子组是（ ）
A.
Na + 、K + 、MnO 4 — 、Cl —
B.
Cl — 、SO 4 2— 、K + 、Na +
C.
Na + 、Cl — 、CH 3 COO — 、K +
D.
K + 、I — 、Na + 、ClO —
【简答题】A signal source has an open-circuit voltage of 10mV and a short-circuit current of 10μA. The source resistance is kΩ
【单选题】On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously, resulting in a collision. Following this collision, what will the hosts do? (Select all valid answers)
A.
The destination host sends a request to the source for retransmission.
B.
The jam signal indicates that the collision has been cleared.
C.
The hosts will attempt to resume transmission after a time delay has expired.
D.
An electrical pulse indicates that the collision has cleared.
E.
The router on the segment will signal that the collision has cleared.
F.
The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
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