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【单选题】
选择性阻断 β1受体的药物是A.
吲哚洛尔
B.
拉贝洛尔
C.
噻吗洛尔
D.
普萘洛尔
E.
阿替洛尔
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反馈参考答案：
举一反三
【单选题】You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network， you experienced network problems because you reconnected wrong fibers to wrong ports...
A.
Only use fiber in pairs.
B.
Configure root guard on your switches.
C.
Do not use fiber but use copper.
D.
Configure UDLD to prevent one-way link conditions.
【单选题】You are reconnecting a three-phase induction motor to the supply line. To prevent possible damage to the load, due to the wrong direction of rotation, you should ______.
A.
connect the motor and then use the 'jog' button to determine the direction of rotation
B.
connect the phase indicator to the motor leads, rotate the motor by hand and then connect to the supply voltage
C.
connect the phase indicator to the supply voltage then connect the motor
D.
check the supply line phase sequence and motor rotation with appropriate indicators, then connect correspondingly marked leads
【单选题】金刚石的晶体结构属于 点阵, 其致密度为 。
A.
体心立方 0.68
B.
体心立方 0.54
C.
面心立方 0.34
D.
面心立方 0.74
E.
体心立方 0.34
F.
面心立方 0.52
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