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当前学科：高级食品检验工
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在蜡纸上加1滴磷钼酸铵试剂，烘干，加1滴某食品的消化液，再加1滴磷钼酸铵试剂，如显兰色，示该样液中有（）。
A . Hg＋＋
B . Sn＋＋
C . Pb＋＋
D . Cu――
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推荐知识点:
机组风闸的投入条件是转速降到35%nH左右。
Talking to Kids about SARS School age children may be learning about SARS from adults and the media, but may not know what to make of the situation, says a national health charity. The Lung Association says parents should take time to talk to their ____1____ and explain the facts about SARS and how to avoid the illness. The following is based on recommendations ____2____ Thursday by the Lung Association: Ask your children if they have heard ____3____ SARS at school, from friends, from TV, etc. Finding out what they already know can be a good ____4____ to start the conversation and to clear away any wrong ideas they might have about the illness and how it is spread. School age children are usually old ____5____ to understand concepts such as getting sick from germs and how to avoid illness. A simple reminder ____6____ to cough on people and to wash their hands often may be sufficient for younger kids. All children should be shown how to ____7____ their hands properly. Remember to keep it simple so ____8____ not to overwhelm children with information, but answer them truthfully. Kids can tell when you're not being honest or if your're hiding something, and sometimes the unknown can be more frightening than the ____9____ . Parents with anxious children will know how their kids will handle information on SARS and can tailor their discussion accordingly. One way to explain the illness is to tell children that SARS is like a bad breathing problem. It is ____10____ from a cold, but people can catch it in the same ways—such as coughing on someone, not washing your hands or sharing a glass with a sick person. ___5___内选项为（）
为什么近年来开始停止生产和使用有机氯农药？
冲击功初试不合，可从同一抽样产品上再取3个试样进行试验，6个试样的平均值不得低于规定值，允许有（）个试样低于规定值，但其中低于规定值70%的试样只允许（）个。
弧焊机器人的控制系统不仅要保证机器人的精确运动，而且要具有（）性。
跳电引起补充氢压缩机停运后，应采取（）。
简述市场调研流程。
更年期妇女显著的心理特点是（）。
关于"肾盂积水"的影像，下列说法错误的是（）