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【多选题】
下列关于对机械设备安全防护罩的技术要求，说法正确的是( )。A.
使用的防护罩不允许给生产场所带来新的危险
B.
不影响操作，在正常操作或维护保养时需拆卸防护罩
C.
防护罩必须坚固、可靠，以避免与活动部件接触造成损坏和工件飞脱造成的伤害
D.
防护罩一般可以脚踏和站立，必须做平台或阶梯时，平台或阶梯应能承受1500N的垂直力，并采取防滑措施
E.
开启式防护罩打开一部分失灵时，应使活动部件不能运转或运转中的部件停止运动
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【判断题】The bulk regions outside the SCL have high conductivities, due to the plenty of majority carriers in the bulk, in comparison with depletion region in which there are mainly immobile ions (with larger ...
A.
正确
B.
错误
【简答题】A current-carrying gold wire has diameter 0.84 mm. The electric field in the wire is 0.49V/m. The current carried by the wire equals A. (The resistivity of gold is 【图片】) (Be accurate to two deci...
【单选题】Which of the following is NOT true according to the poor electrical and thermal conduction property of ceramics?
A.
The valence electrons are tied up in bonds and are not free in ceramics
B.
Diamond which is classified as a ceramic has the highest thermal conductivity of any known material
C.
the oxide ceramic ReO3, has an electrical conductivity at room temperature similar to that of Cu
D.
the mixed oxide YBa2Cu3O7 has zero resistivity below 92℃
【单选题】According to Figure 1, which of the following state-ments best describes how the resistivity of the sandand gravel layer compares to the resistivity of the tilllayers? The resistivity measured in the ...
A.
lower than the resistivities measured in any of the till layers.
B.
higher than the resistivities measured in any of the till layers.
C.
the same as the resistivities measured in the sur-face sediments.
D.
lower than the resistivities measured in the bed-rock.
【单选题】If the IT0 and IT1 bits of the TCON register are , an interrupt will be generated on high to low transition, i.e. on thefallingpulse edge (only in that moment).
A.
set
B.
cleared
C.
high resistivity state
D.
not determined
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