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【单选题】
锥形鍃按其锥度大小可分60°、75°、90°和120°四种,其中____使用最。A.
60°
B.
75°
C.
90°
D.
120°
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皮皮学刷刷变学霸
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【多选题】以下哪种情况可使用一张配电第一种工作票（）
A.
一条配电线路（含线路上的设备及其分支线，下同）或同一个电气连接部分的几条配电线路或同（联）杆塔架设、同沟（槽）敷设且同时停送电的几条配电线路
B.
不同配电线路经改造形成同一电气连接部分，且同时停送电者
C.
同一电压等级、同类型、相同安全措施且依次进行的不同配电线路或不同工作地点上的不停电工作
D.
同一高压配电站、开闭所内，全部停电或属于同一电压等级、同时停送电、工作中不会触及带电导体的几个电气连接部分上的工作
E.
配电变压器及与其连接的高低压配电线路、设备上同时停送电的工作
F.
同一天在几处同类型高压配电站、开闭所、箱式变电站、柱上变压器等配电设备上依次进行的同类型停电工作
【单选题】Honsewives who do not go out to work often feel they are not working to their full ______.
A.
capacity
B.
faculty
C.
strength
D.
content
【多选题】Explain the three main classes of c ell-surface receptors.
A.
All cell-surface receptor proteins bind to an extracellular signal molecule and transduce its message into one or more intracellular signaling molecules that alter the cell’s behavior. Most of these receptors belong to one of three large classes, which differ in the transduction mechanism they use.
B.
1. Ion-channel-coupled receptors change the permeability of the plasma membrane to selected ions, thereby altering the membrane potential and, if the conditions are right, producing an electrical current.
C.
2. G-protein-coupled receptors activate membrane-bound, trimeric GTP-binding proteins (G proteins), which then activate (or inhibit) an enzyme or an ion channel in the plasma membrane, initiating an intracellular signaling cascade.
D.
3. Enzyme-coupled receptors either act as enzymes or associate with enzymes inside the cell; when stimulated, the enzymes can activate a wide variety of intracellular signaling pathways. Many enzyme-coupled receptors have their own enzyme activity, while others rely on an enzyme that becomes associated with the activated receptor.
【单选题】The local people were amazed to find that these volunteers were working to their full ______.
A.
probability
B.
capacity
C.
ability
D.
capability
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