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产品的安全性是指产品在使用、储运、销售等过程中,保障人体健康和人身、财产安全免受损失的能力。A.
正确
B.
错误
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【简答题】A．The solar system is a bit smaller than the great bear. B．The solar system is bigger than the great bear. C．The solar system is much smaller than the great bear. D．The solar system is as big as the g...
【简答题】下图是单相桥式整流滤波稳压电路。当变压器副边电压的有效值U 2 =15V时，两个稳压管的稳压值分别为D Z1 =3V，D Z2 =6V，正向压降为0V。分析以下各种情况时的输出电压U 0 的值。 ① 正常情况下 ②当D Z1 倒过来时 ③当D Z1 、D Z2 都倒过来时。 ⑤去掉D Z1 、D Z2 和R时。 ⑤再去掉电容C时。 ⑥当负载开路时。 ⑦当负载接好，但出现D 1 虚焊时。 ⑧当负载接...
【简答题】电力电子电路运行不正常或发生故障时，可能会发生过电流，主要分为过载和 两种情况。
【多选题】以下打混凝土预制桩一按规定中,哪些做法是正确的:()。
A.
吊桩前应将桩锤提升到一定位置固定牢靠 , 防止吊桩时桩锤坠落。
B.
起吊时吊点必须正确 , 速度要均匀 , 桩身应平稳 , 必要时桩架应设缆风绳。
C.
桩身附着物要清除干净 , 起吊后 , 人员不准在桩下通过。
D.
吊桩与运桩发生干扰时 , 应停止运桩。
E.
插桩时，手脚严禁伸入桩与龙门之间。
【简答题】A positive ion is therefore smaller than the corresponding and the more electrons removed (that is, the greater the charge on the ion), the smaller it becomes.
【简答题】Australia is the smallest continent in the world. It is a little smaller than China. It is on the Southern Hemisphere of the earth. Australia is big, but its population is small. The population of Aus...
【简答题】A．The smaller it is, the cleverer it is. B．The smaller it is, the less it costs. C．It's small, but stores a lot of information. D．It's a new tool which is used in computers only.
【单选题】The____ is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.
A.
main stem stop valve
B.
auxiliary steam stop valve
C.
feed check or control valve
D.
blow down valve
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